![]() reproductive system The body organ system responsible for reproduction. nervous system The organ system that forms a communication and coordination network between all parts of an animal's body. immune system An animal body's system of defenses against agents that cause disease. The lymphatic system helps remove toxins and pathogens from the blood and interstitial fluid and returns fluid and solutes from the interstitial fluid to the circulatory system. lymphatic system The vertebrate organ system through which lymph circulates includes lymph vessels, lymph nodes, and the spleen. endocrine system The organ system consisting of ductless glands that secrete hormones and the molecular receptors on or in target cells that respond to the hormones cooperates with the nervous system in regulating body functions and maintaining homeostasis. digestive system The organ system involved in ingestion and digestion of food, absorption of nutrients, and elimination of wastes. (Cardiac muscle and smooth muscle are components of other organ systems.) urinary system The organ system that forms and excretes urine while regulating the amount of water and ions in the body fluids. muscular system All the skeletal muscles in the body. skeletal system The organ system that provides body support and protects body organs such as the brain, heart, and lungs. integumentary system The organ system consisting of the skin and its derivatives, such as hair and nails in mammals helps protect the body from drying out, mechanical injury, and infection. ![]() It supplies the blood with O2 and disposes of CO2. respiratory system The organ system that functions in exchanging gases with the environment. circulatory system The organ system that transports materials such as nutrients, O2, and hormones to body cells and transports CO2 and other wastes from body cells. neuron A nerve cell the fundamental structural and functional unit of the nervous system, specialized for carrying signals from one location in the body to another. nervous tissue Tissue made up of neurons and supportive cells. smooth muscle Muscle made up of cells without striations, found in the walls of organs such as the digestive tract, urinary bladder, and arteries. cardiac muscle Striated muscle that forms the contractile tissue of the heart. The contraction of striated muscles produces voluntary movements of the body. skeletal muscle (striated muscle) Striated muscle attached to the skeleton. muscle tissue Tissue consisting of long muscle cells that are capable of contracting when stimulated by nerve impulses the most abundant tissue in a typical animal. blood A type of connective tissue with a fluid matrix called plasma in which blood cells are suspended. bone A type of connective tissue consisting of living cells held in a rigid matrix of collagen fibers embedded in calcium salts. Cartilage A flexible connective tissue consisting of living cells and collagenous fibers embedded in a rubbery matrix.
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