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Human body systems
Term | Definition |
---|---|
Tissue | A group of similar cells that perform a specific function |
organ | A body structure that is composed of different kinds of tissues that work together |
organ system | A group of organs that work together to perform a major function |
Gland | An organ that produces and releases chemicals either through ducts or into the bloodstream |
Hormone | The chemical produced by an endocrine gland,A chemical that affects growth and development |
Stress | The reaction of a person's body to potentially threatening challenging or disturbing events |
Interactions | The direct effect that one thing has on another |
Stable | Resistant to sudden change |
Digestion | The process by which your body breaks down food into small nutrient molecules |
Nutrients | The substances in food that provide the raw materials the body's cells need to carry out all their essential processes |
Absorption | The process by which nutrient molecules pass through the wall of the digestive system into the blood |
Carbohydrates | A energy-rich organic compound,such as sugar or startch,that is made of the elements carbon |
Peristalsis | Waves of smooth muscle contractions that move food through the esophagus toward the stomach |
Saliva | Fluid released from glands in the mouth that play an important role in mechanical and chemical reactions in the body |
Circulatory System | An organ system that transports needed materials to cells and removes waste |
Contract | To draw together; To reduce in size |
Artery | A blood vessel that carries blood away from the heart |
Vein | A blood vessel that carries blood back to the heart |
Capillary | A tiny blood vessel where substances are exchanged between the blood and body cells |
Lymph | Fluid that travels through the lymphatic system consisting of water, white blood cells, and dissolved materials |
Bronchi | The two passages that direct air into the lungs |
Alveoli | Tiny thin-walled sacs of lung tissue specialized for the movement of gasses between air and blood |
Excretion | The process of moving waste |
Nephron | Small filtering structure in the kidneys that removes wastes from blood and produces urine |
Neuron | A cell that carries information through the nervous system |
Synapse | The junction where one neuron can transfer an impulse to another neuron |
Impulse | The message carried by a neuron |
Brain | The part of the central nervous system that is located in the skull and controls most functions of the body |
Spinal cord | Thick column of nervous tissue that links the brain to most of the nerves that branch out through the body |
Reflex | Automatic response that occurs without conscious control through the somatic nervous system |
Negative feedback | The process by which a system is turned off by the condition it produces |