click below
click below
Normal Size Small Size show me how
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 that together to perform a major function |
Gland | An organ that produces and releases chemicals either through ducts or into the bloodstream |
Hormone | (1)The chemical produced by an endocrine gland (2) 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 nutrients 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 starch, that is made of the elements of 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 | 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 blood & body cells |
Lymph | fluid that travels through the lymphatic system |
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 & blood |
Excretion | the process of moving wastes |
Nephorn | 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 and 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 |