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
What term best describes the relationship between the pronator quadratus and supinator?
A) Fixators B) Prime movers C) Synergists D) Antagonists E) Depressors
Label I represents which of the following structures?
A) syncytial trophoblast
B) developing villi
C) lacuna
D) uterine gland
E) amniotic cavity