Human Anatomy & Physiology Laboratory Manual Cat Version Review Sheet 8 Answers
Human body systems
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The human torso is a biological machine made of trunk systems; groups of organs that work together to produce and sustain life. Sometimes we get lost while studying about cells and molecules and can't see the wood for the trees. It can be helpful to step back and wait at the bigger anatomical moving-picture show.
This topic page will provide you with a quick introduction to the systems of the human body, so that every organ you learn later on volition add a superstructure to the basic concept you adopt hither.
| Organisation of organs | A group of organs that work together to perform 1 or more functions in the body. |
| Musculoskeletal arrangement | Mechanical back up, posture and locomotion |
| Cardiovascular system | Transportation of oxygen, nutrients and hormones throughout the body and elimination of cellular metabolic waste product |
| Respiratory organisation | Commutation of oxygen and carbon-dioxide betwixt the body and air, acrid-base residuum regulation, vox. |
| Nervous organization | Initiation and regulation of vital trunk functions, sensation and body movements. |
| Digestive arrangement | Mechanical and chemic deposition of food with purpose of absorbing into the body and using every bit energy. |
| Urinary system | Filtration of blood and eliminating unnecessary compounds and waste past producing and excreting urine. |
| Endocrine system | Production of hormones in order to regulate a wide variety of actual functions (e.g. menstrual cycle, carbohydrate levels, etc) |
| Lymphatic organization | Draining of backlog tissue fluid, immune defense force of the body. |
| Reproductive organisation | Product of reproductive cells and contribution towards the reproduction procedure. |
| Integumentary organization | Concrete protection of the body surface, sensory reception, vitamin synthesis. |
Contents
- Skeletal system
- Muscular system
- Cardiovascular system
- Respiratory organization
- Nervous system
- Central nervous system
- Peripheral nervous system
- Somatic and autonomic nervous systems
- Digestive organisation
- Urinary arrangement
- Endocrine organisation
- Lymphatic system
- Reproductive system
- Integumentary system
- Sources
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Skeletal organisation
The skeletal system is composed of basic and cartilages. There are two parts of the skeleton; centric and appendicular. The centric skeleton consists of the bones of the head and trunk. The appendicular skeleton consists of the bones inside the limbs, as well every bit supporting pectoral and pelvic girdles.
There are 206 bones in an adult human body. The place at which two bones are fitted together is called the joint or joint. Joints are supported by cartilages and reinforced with ligaments. Functions of the skeletal system are mechanical support, movement, protection, blood prison cell production, calcium storage and endocrine regulation.
Elements of the skeletal organisation are adapted to the office of the body part they support. Thus, the beefcake of bones, joints and ligaments is studied topographically, every bit the basic of the; head and neck, thorax, belly, upper and lower limbs.
Get started with skeletal organisation anatomy by checking out the study unit and custom quiz below.
Muscular system
The muscular system consists of all the torso muscles. In that location are iii muscle types; smooth, cardiac and skeletal muscles. Shine muscle is found within walls of claret vessels and hollow organs such as the stomach or intestines. Cardiac musculus cells form the heart musculus, also chosen the myocardium. Skeletal muscles attach to the bones of the body.Amid these three, just skeletal muscles can be controlled consciously and enable united states of america to produce body move, while the function of other two muscle types is regulated by the autonomic nervous system and is absolutely unconscious. Histologically, skeletal and cardiac muscle fibers are arranged in a repetitive fashion giving a striped appearance, hence are called striated muscle. Smooth musculus does not contain repetitive sarcomeres, thus is non-striated muscle.
Learn all near the muscular organization in the study unit beneath, or consolidate what y'all already learned with our fully customizable quiz.
Cardiovascular arrangement
The cardiovascular organization is comprised of the heart and the circulatory system of blood vessels. The center is composed of four chambers; two atria and two ventricles. Blood enters the middle through the upper chambers of the left and correct atria and exits via the left and right ventricles. Heart valves prevent the backflow of blood.
The heart acts every bit a two-way pump. The right side of the center pumps deoxygenated claret into the pulmonary circulation of the lungs, where the claret is reoxygenated again. While the left side of the middle simultaneously pumps oxygenated claret into the systemic circulation, distributing information technology to the peripheral tissues. The regular pumping, or heartbeat, is controlled by the conduction arrangement of the heart.
The circulatory system, also called the vascular system, consists of arteries, veins and capillaries. They all contain a continuous network of vessels which act to carry blood around the body. Blood leaves the middle via arteries, these progressively reduce in size to continue as smaller arterial vessels called arterioles. Arterioles end in a web of even smaller vessels called capillaries. The exchange of gases and nutrients occurs through the capillary walls.
Small veins, called venules, leave from capillaries and gradually increase their lumen on the style to the heart to end every bit veins. At that place is a certain histological divergence betwixt arteries and veins, but their chief functional difference reflects the management in which they bear blood: the arteries convey blood from the heart to the periphery, whereas the veins convey blood from the periphery to the heart.
There are iii separate circuits to the circulatory system.
- The pulmonary apportionment which carries blood between the centre and the lungs;
- The coronary circulation which supplies claret to the muscle of the center;
- And the systemic circulation which carries blood to the rest of the body.
Major arteries within the systemic circulatory system are the aorta and its branches, while the master representatives of the veins are the superior vena cava and inferior vena cava.
Larn everything about the centre, arteries and veins faster with our cardiovascular organization diagrams, quizzes and free worksheets.
Major functions of the cardiovascular system include transportation of oxygen, nutrients and hormones throughout the body within the blood, and as well as eliminating carbon dioxide and other metabolic waste material.
Learn more about the major arteries, veins and nerves of the trunk with Kenhub resource!
Respiratory organisation
The respiratory system consists of a serial of organs; the nasal cavity, throat, larynx, trachea, bronchi, bronchioles and lungs (alveoli). The nasal cavity and pharynx are together chosen the upper respiratory system, while the rest of the organs contain the lower respiratory organization.
Respiratory organisation organs, with the exception of the alveoli, function to acquit air into the lungs aided past the muscles of respiration (mainly the diaphragm and intercostal muscles).
In one case air is in the lungs it enters alveoli (the site of gas exchange) and interacts with blood transported by the pulmonary circulation. Hither carbon dioxide is removed from, and oxygen returned to, the claret. Thus the major respiratory system office is to bring oxygen into the trunk and miscarry carbon dioxide.
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Nervous system
Nervous system controls how nosotros collaborate with and respond to our environs, by decision-making the function of the organs in our other torso systems. The nervous system organs are the brain, spinal cord and sensory organs. These are connected by neurons, which act to transmit neural signals around the body.
Morphologically and topographically, the nervous system is divided into the central (CNS) and peripheral (PNS) nervous systems. Whilst functionally, the nervous organisation is considered as two parts; the somatic (SNS) or voluntary nervous system, and the autonomic (ANS) or involuntary nervous arrangement.
Central nervous arrangement
The central nervous system definition is that it receives information from the torso's environment and generates instructions, thereby decision-making all the activities of the human body. This two-style data flow into, and out of, the CNS is conveyed by the peripheral nervous system.
The CNS consists of the brain and spinal cord. The brain is placed within the neurocranium, and is formed from the cerebrum, cerebellum and brainstem (pons and medulla oblongata). The fundamental parts of the CNS are occupied by spaces called ventricles filled with cerebrospinal fluid (CSF). The spinal cord is placed within the vertebral column. The spinal canal extends through the central part of the spinal string. It is likewise filled with CSF and information technology communicates with the ventricles of the brain.
The CNS is made of neurons and their processes (axons). Gray matter is made of neuron prison cell bodies, it is found in the cognitive cortexand the central portion of the spinal string. White affair is made of axons, which combine and build neural pathways. The gray matter is where the instructions generate, while the white matter is the path through which the instructions travel toward the organs.
Peripheral nervous system
The peripheral nervous organization definition is that it conducts information from the CNS to the target tissues, and from the target tissues to the CNS. Information technology consists of fretfulness and their ganglia. Fretfulness that carry information from peripheral sense organs (for example center, tongue, nasal mucosa, ear, pare) to the CNS are called the ascending, afferent or sensory nerve fibers. Fibers that carry data from the CNS to the periphery (muscles and glands) are the descending, efferent, motor or secretory nerve fibers.
A ganglion is a cluster of neural tissue exterior of the CNS, made of neuronal prison cell bodies. Ganglia can exist both sensory and autonomic. Sensory ganglia are associated with spinal nerves and some cranial nerves (Five, VII, Nine, X).
Peripheral nerves emerge from the CNS. In that location are 12 pairs of cranial nerves which arise from the brain, and 31 pairs of spinal nerves which extend from the spinal cord. Cranial nerves are named I to XII, adamant by their skull exit location (anterior to posterior). Spinal nerves are divided into 8 cervical, 12 thoracic, v lumbar, 5 sacral and i coccygeal nerve, depending on vertebral level from which they arise. In sure areas of the trunk peripheral fretfulness interconnect, creating neural networks chosen plexuses. Notable plexuses are the:
- Cervical plexus (C1-C4) – innervates the dorsum of the caput, some neck muscles, pericardium and diaphragm via greater auricular, transverse cervical nerve, bottom occipital, supraclavicular, and phrenic nerves.
- Brachial plexus (C5-T1) – innervates the upper limb with nerves such as median, ulnar, radial, musculocutaneous and axillary nerve.
- Lumbar plexus (L1-L4) – innervates the muscles and the skin of the abdomen and pelvis, also as thigh muscles via iliohypogastric, ilioinguinal, genitofemoral, lateral femoral cutaneous, obturator, femoral nerves.
- Sacral plexus (S1-S4, with branches from L4, L5) – innervates the muscles and skin of parts of the pelvis, posterior thigh, lower leg and foot via the post-obit nerves; gluteal, sciatic, posterior femoral cutaneous, pudendal, nerve to piriformis, nerve to obturator internus, and nervus to quadratus femoris.
Somatic and autonomic nervous systems
The somatic nervous system (SNS) and autonomic nervous system (ANS) are divisions of the peripheral nervous system, with information conveyed through the cranial and spinal fretfulness.
The somatic nervous system definition is that information technology allows voluntary control over our movements and responses. It conveys sensory and motor information between the peel, sensory organs, skeletal muscles and the CNS; establishing communication of the man body with its environment and response to outside stimuli. Major somatic peripheral nerves include the median nerve, sciatic nervus and femoral nerve.
The autonomic nervous organisation definition is that it controls all the internal organs unconsciously, through the associated shine muscle and glands. Functionally, the ANS is divided into sympathetic(SANS) and parasympathetic(PANS) autonomic nervous systems. The sympathetic nervous organisation definition is informally known as producing the „flight or fight" land as it is the function of the ANS which is mostly active during stress.PANS dominates during rest, and is more than active in „residual and digest" or „feed and breed" activities. The centers of SANS and PANS are within the brainstem and spinal cord, and they communicate with SANS and PANS ganglia located throughout the body. Note that there isn't any pure SANS or pure PANS nerve, instead their fibers are added to the specific somatic nerves, making them mixed.
Digestive system
The digestive system function is to dethrone food into smaller and smaller compounds, until they can be absorbed into the trunk and used equally energy. Information technology consists of a series of alimentary canal organs and accessory digestive organs.
The digestive system organs spread from the mouth to the anal canal. And then it's actually a tube consisting of the rima oris, pharynx, esophagus, tummy, small-scale intestine, big intestine, and anal canal. Accessory digestive organs assist with the mechanical and chemical food breakdown, these are the tongue, salivary glands, pancreas, liver and gallbladder.
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Urinary organization
Urinary system is a body drainage system comprised of the grouping of organs that produce and excrete urine. It consists of the kidneys, ureters, urinary bladder and urethra.
Kidneys are paired edible bean-shaped organs placed retroperitoneally. The kidneys have a rich claret supply provided by the renal artery. Nephrons within the kidneys filter the blood that passes through their web of capillaries (glomerulus). The blood filtrate then passes through a series of tubules and collecting ducts, eventually forming the terminal ultrafiltrate, urine. Urine passes into the ureters, tubes of polish muscle that convey urine from the kidneys to the urinary bladder. The bladder is a hollow muscular organ that collects and stores urine before disposal by urination (micturition). Functions of the urinary system include; elimination of body waste, regulation of blood volume and claret force per unit area, regulation of electrolyte levels and blood pH.
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Endocrine system
The endocrine system is a collection of specialised organs (endocrine glands) scattered throughout the body that act to produce hormones. The principal organs of the endocrine system can be seen in the diagram below.
With regards to the endocrine system function; hormones produced by the endocrine system act to regulate a wide multifariousness of actual functions, such as triiodothyronine which regulates metabolism, or estrogen and progesterone which regulate the menstrual cycle. Endocrine glands secrete hormones straight into the circulatory system to regulate the function of distant target organs.
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Lymphatic system
The lymphatic system is a network of lymphatic vessels that drains excess tissue fluid (lymph) from the intercellular fluid compartment, filters information technology through lymph nodes, exposes information technology to lymphocytes (white blood cells) of the immune system and returns the fluid to the circulatory system. The lymphatic system consists of lymph, lymphatic plexuses, lymphatic vessels, lymph nodes and lymphoid organs. The lymphatic organisation role is to; convey and eliminate toxins and waste product from the trunk; recirculate proteins; and defend the torso from microorganisms.
Lymph is a watery tissue fluid with a like consistency to blood plasma. It starts as interstitial fluid which occupies the spaces between cells. Backlog fluid is picked upwardly past lymphatic capillaries and transported through lymphatic plexuses into lymphatic vessels, filtering through lymph nodes along its journey. Superficial lymphatic vessels are found in the subcutaneous tissue alongside veins. They drain into deep lymphatic vessels that follow the arteries. Lymphatic vessels empty into larger lymphatic trunks, which unite to grade one of the two main collecting ducts; the thoracic duct and the right lymphatic duct.
The thoracic duct begins at the cisterna chyli, collecting lymph from the left side of caput, neck and thorax, left upper limb, abdomen and both lower limbs and draining it into the left venous angle (junction of the left internal jugular and left subclavian veins). The right lymphatic duct drains the rest of the body and empties into the right venous angle. From the venous angles, cleaned lymph is returned to the circulatory system, rejoining with the fluid of the claret. Annotation that the central nervous organization was previously idea to have no lymphatic vessels. However, recent inquiry has shown its lymph is drained by lymph vessel-similar structures found in the meninges.
Lymphatic system organs are divided into primary and secondary organs. Primary lymphatic organs produce lymphocytes and release them into lymphatic vessels. The two primary lymphoid organs are the thymus and red bone marrow. Secondary lymphatic organs include lymph nodes, tonsils, appendix and spleen. Lymph nodes are masses of lymphocyte containing lymphoid tissues, attached to lymphoid vessels. Lymph nodes function to filter cellular debris, foreign pathogens, excess tissue fluid, and leaked plasma proteins. There are aggregations of lymph nodes at cardinal points around the body (cervical, axillary, tracheal, inguinal, femoral, and deep nodes related to the aorta).
Reproductive organization
The reproductive system, or genital arrangement, is a system of internal and external sexual practice organs which piece of work together to contribute towards the reproduction process. Different other systems of organs, the genital system has meaning differences among sexes.
The external female sex organs, also known every bit the genitals, are the organs of the vulva (the labia, clitoris, and vaginal opening). The internal sex organs are the ovaries, fallopian tubes, uterus and vagina. The vulva provides an entry to, and protection, for the vagina and uterus, besides as the proper warmth and moisture that aids in its sexual and reproductive functions. In add-on, it is of import for the sexual arousal and orgasm in females.
The vagina is the canal leading from the outside of the body to the cervix (neck) of the uterus. Ovaries secrete hormones and produce egg cells, which are transported to the uterus fallopian tubes. The uterus provides protection, diet, and waste removal for the developing embryo and fetus. In addition, contractions in the muscular wall of the uterus contribute to pushing out the fetus at the time of birth.
The external male sex organs are the testes and penis, while the internal are the epididymis, vas deferens and accessory glands. Functionally, they tin can be grouped into three categories.The first category is for sperm production (the testes), and storage (epididymis). The 2d category organs produce ejaculatory fluid; the vas deferens and the accessory glands (seminal vesicles and prostate). The last category is those used for copulation and deposition of the sperm, these include the penis, urethra and vas deferens.
Integumentary system
The integumentary organisation is the set of organs that forms the external covering of the body. Information technology includes the skin, pare appendages, sweat glands and sensory receptors.
The pare is the largest organ of the body. It has three layers; epidermis, dermis and hypodermis. The epidermis is a thick keratinized epithelium made of multiple cell layers. Underneath the epidermis is the dermis, a layer of connective tissue that contains blood vessels and nerves that supply the peel. The underlying fascia, also called the hypodermis, consists of fatty, connective tissue and peel appendages (hair, nails, sebaceous and sweat glands).The integumentary system functions are various. It forms a continuous layer that protects the torso from various damaging events, such as external injuries, loss of water and estrus, and the carcinogenic effects of UV rays. It as well excretes waste, contains sensory receptors to detect pain, sensation, pressure level, and temperature, and provides for vitamin D synthesis.
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