To stimulate muscle contraction, acetylcholine is released from the ________ into the synaptic cleft
A) synaptic vesicles
B) sarcolemma
C) terminal cisterna
D) junctional folds
E) sarcoplasmic reticulum
A
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Biological half-life is the time required for
A. half of an ionic compound to ionize.?B. half of a radioactive material to be eliminated from the body.?C. radioactivity levels of organic compounds to stabilize at one-half their original value. ?D. radiation exposure that is lethal for half of a biological population.
Where is the anterior gray horn?
a) B b) C c) H d) I e) None of these choices
Label I represents which of the following structures?
A) syncytial trophoblast
B) developing villi
C) lacuna
D) uterine gland
E) amniotic cavity
What term best describes the relationship between the pronator quadratus and supinator?
A) Fixators B) Prime movers C) Synergists D) Antagonists E) Depressors