下面留学360为大家搜集整理的是关于SAT2生物词汇中字母A打头的词汇。记忆SAT2生物词汇对于大家更快更好的备考SAT2生物考试有非常重大的影响，下面跟随留学360就一起来看看这些关于生物的SAT2词汇详细内容吧。
abiotic (无生命的)
Nonliving materials in the environment—such as elements, sunlight, and soil—that influence and are influenced by living (biotic) entities on the planet.
Acetylcholine(乙酰胆素): 运动神经释于一种化学物质,与其接受体结合后，能产生足够的电位变化来引起肌肉运动
A neurotransmitter released from the axons of nerve cells to excite an action potential or trigger a muscle to contract.
active immunity(主动免疫)
Protective immunity to a disease in which the individual produces antibodies as a result of previous exposures to the antigen.
Acids(酸)
Hydrogen ion (H+) donors. Acids are very important in the chemical reactions of life because they are highly reactive. Acids have pH values below 7. They are the opposite of bases.
actin (肌动蛋白)
Protein filaments that, along with myosin, allow muscles to contract.