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 organs that work together to perform a major function |
Gland | an organ that produces and realeases |
hormone | 1,the chemical produced by an endocrine gland, 2,A chemical that affects growth development |
stress | the reaction of a person's body 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 cells need to carry out all their essential processes |
absorption | the process by which nutrient molecules pass through the wall of 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 stumach |
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 | 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 |
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 |
excretion | the process of moving wastes |
nephron | small filtering structure in the kidneys that removes waste 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 an neuron |
brain | the part of the central nervous system that is located in the skull and contols most functions |
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 |