Neurotransmitters are released from the ________.
A. epineurium
B. postsynaptic membrane
C. Ca2+ channels
D. presynaptic terminal
E. synaptic cleft
Answer: D
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Which of the following is a secondary sexual characteristic promoted by estrogen?
A. growth of the mammary glands B. enlargement of the external genitalia C. stimulation of oogenesis D. thickening of cervical mucus
________ is the natural, temporary absence of consciousness from which a person can be aroused by normal stimulation.
Fill in the blank(s) with the appropriate word(s).
What regulatory proteins can be found in the thin filaments of skeletal muscle fibers?
a) troponin and titin b) tropomyosin and troponin c) myosin and titin d) titin and tropomyosin e) tropomyosin and myosin