| A | B |
|---|
| aorta | the largest artery in the body. directs blood throughout the body |
| angiosperm | plants that produce flowers, fruits and seeda |
| adhesion | tendency of different substances to stick together due to attractive forces |
| ADH | hormone that regulates the absorption of water. high levels cause the body to retain more water |
| adrenal cortex | gland stimulated by ACTH produce glucocorticoids |
| apoplast | spaces between cell walls in the roots of plants that allow for the flow of water |
| archaebacteria | one of two kigndoms of bacteria. cell walls lack peptidoglycan the polymer found in most bacteria. Contain RNA similar to eukaryotes |
| associative learning | process of learning throught repeated exposure. Like a dog salivating at the sound of a bell |
| ATP synthase | channels found in the membrane of the mitochondria. the movmement of H+ is powers the production of ATP |
| autonomic nervouse system | involuntary response such as heartbeat, breathing. split into the sympathetic and parasympathetic system |
| ACTH | produces by the pitiuatary gland stimulates the adrenal cortex to produce glucocorticoids |
| autosomes | 22 pairs of chromosomes the exclude the X and Y chromosomes |
| autotrophs | producers that make their own food from elements in the environment |
| auxins | a class of plant hormones. they promote plant growth and cause the plat to grow in a specific direction like toweards the sun |
| agonistic behavior | occurs when members of the same population have to compete for resources. like lions fighting over a kill |
| axon | part of a neuron. It is a long extension of the cell body. It's purpose is to transmit the impulse |
| arthropoda | animals with a segmented body with paired jointed legs and an exoskeleton |
| antiparallel DNA | refers to complimentary strands of DNA that run in opposite directions. One end starts with the 5 carbon side which ends in phosophate. The opposite side is the 3 carbon side which ends in an hydroxly groups |
| alternation of generation | describes how plants spend part of their lives in the haploid states and half in the diploid state. The haploid state is called gametophytes the diploid is called sporophytes |
| antigen | any foreign substance recognized by the immune system. |
