click below
click below
Normal Size Small Size show me how
Human Body Systems
Term | Definition |
---|---|
Tissue | A group of similar cells that preform 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 preform 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. (2) A chemical that effects growth and development. |
Stress | The reaction of a person's body to potentially threantening, challenging, or disturbing events. |
Interactions | The direct effect that one thing has on ano |
Stable | Resistant to sudden change. |
Digestion | The process by which your body breaks down food into small nutrient moleclues. |
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 starch, that is made of the elements carbon, hydrogen and oxygen. |
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 digestion. |
Enzymes | Proteins that speed up chemical reactions in the body. |
Elimination | Act of removal of materials from the body. |
Circulatory System | Ab 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 gases between air and blood. |
Excreation | The process of moving wastes. |
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 must 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. |