Organ locations of the human body

Every tissue within the body requires oxygen to function. The respiratory system , which includes air passages, pulmonary vessels, the lungs, and breathing muscles, provides oxygenated blood to the body tissues and removes waste gases. The digestive system enables your body to convert food into usable nutrients through a chemical breakdown process. This occurs through a system of tube-like of organs, including the esophagus, stomach, liver, pancreas, and intestines. The skeletal system gives the body its basic framework, providing structure, protection, and movement.

The bones in the body also produce blood cells, store important minerals, and release hormones necessary to life. The muscular system is comprised of the sum total of muscles throughout the body that move the skeleton, maintain posture through steady contraction, and generate heat through cell metabolism.

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Humans have three types of muscle. The nervous system allows us to perceive, comprehend, and respond to the world around us. The female reproductive system encompasses all necessary female organs needed to conceive and bear a child. The male reproductive system consists of a series of organs used during sexual intercourse and procreation. The primary organs are the gonads, or sex glands, which produce sperm. In men, these are the testes.

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How long you live is largely within your own control. If any of the five vital organs stops functioning, the death of the organism is imminent without medical intervention. Functionally related organs often cooperate to form whole organ systems. The 12 diagrams in the figures below show 11 human organ systems, including separate diagrams for the male and female reproductive systems.

Some of the organs and functions of the organ systems are identified in the figure.

Each system is also described in more detail in the text that follows. Most of these human organ systems are also the subject of separate chapters in this Flexbook. Organs of the integumentary system include the skin, hair, and nails. The skin is the largest organ in the body. It encloses and protects the body and is the site of many sensory receptors. The skeletal system consists of bones, joints, teeth.

The bones of the skeletal system are connected by tendons, ligaments, and cartilage. Functions of the skeletal system include supporting the body and giving it shape.

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Along with the muscular system, the skeletal system enables the body to move. The bones of the skeletal system also protect internal organs, store calcium, and produce red and white blood cells. The muscular system consists of three different types of muscles, including skeletal muscles, which are attached to bones by tendons and allow for voluntary movements of the body.

Smooth muscle tissues control the involuntary movements of internal organs, such as the organs of the digestive system, allowing food to move through the system. Smooth muscles in blood vessels allow vasoconstriction and vasodilation and thereby help regulate body temperature. Cardiac muscle tissues control the involuntary beating of the heart, allowing it to pump blood through the blood vessels of the cardiovascular system.

The nervous system includes the brain and spinal cord, which make up the central nervous system, and nerves that run throughout the rest of the body, which make up the peripheral nervous system. The nervous system controls both voluntary and involuntary responses of the human organism and also detects and processes sensory information.

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The endocrine system is made up of glands that secrete hormones into the blood, which carries the hormones throughout the body. Endocrine hormones are chemical messengers that control many body functions, including metabolism, growth, and sexual development. The master gland of the endocrine system is the pituitary gland, which produces hormones that control other endocrine glands.

Some of the other endocrine glands include the pancreas, thyroid gland, and adrenal glands. The cardiovascular system also called the circulatory system includes the heart, blood, and three types of blood vessels: arteries, veins, and capillaries. The heart pumps blood, which travels through the blood vessels. The main function of the cardiovascular system is transport. Oxygen from the lungs and nutrients from the digestive system are transported to cells throughout the body.

Carbon dioxide and other waste materials are picked up from the cells and transported to organs such as the lungs and kidneys for elimination from the body. The cardiovascular system also equalizes body temperature and transports endocrine hormones to cells in the body where they are needed.

The urinary system includes the pair of kidneys, which filter excess water and a waste product called urea from the blood and form urine. Two tubes called ureters carry the urine from the kidneys to the urinary bladder, which stores the urine until it is excreted from the body through another tube named the urethra.

The Human Body: Organ Systems｜Animated & Narrated｜

The kidneys also produce an enzyme called renin and a variety of hormones. These substances help regulate blood pressure, the production of red blood cells, and the balance of calcium and phosphorus in the body.

Organs and other structures of the respiratory system include the nasal passages, lungs, and a long tube called the trachea, which carries air between the nasal passages and lungs. The main function of the respiratory system is to deliver oxygen to the blood and remove carbon dioxide from the body. Gases are exchanged between the lungs and blood across the walls of capillaries lining tiny air sacs alveoli in the lungs.

Human Anatomy - Organs

The lymphatic system is sometimes considered to be part of the immune system. It consists of a network of lymph vessels and ducts that collect excess fluid called lymph from extracellular spaces in tissues and transport the fluid to the bloodstream. The lymphatic system also includes many small collections of tissue, called lymph nodes, and an organ called the spleen, both of which remove pathogens and cellular debris from the lymph or blood.

In addition, the thymus gland in the lymphatic system produces some types of white blood cells lymphocytes that fight infections. The digestive system consists of several main organs — including the mouth, esophagus, stomach, and small and large intestines — that form a long tube called the gastrointestinal GI tract.

Food moves through this tract where it is digested, its nutrients absorbed, and its waste products excreted. The digestive system also includes accessory organs such as the pancreas and liver that produce enzymes and other substances needed for digestion but through which food does not actually pass. The reproductive system is the only body system that differs substantially between males and females. Both male and female reproductive systems produce sex-specific sex hormones testosterone in males, estrogen in females and gametes sperm in males, eggs in females. However, the organs involved in these processes are different.

The male reproductive system includes the epididymis, testes, and penis; and the female reproductive system includes the uterus, ovaries, and mammary glands. The male and female systems also have different additional roles. For example, the male system has the role of delivering gametes to the female reproductive tract, whereas the female system has the roles of supporting an embryo and fetus until birth and also producing milk for the infant after birth.