Adaptive defenses
A) involve immunological surveillance.
B) protect against particular threats.
C) do not distinguish between one threat and another.
D) are not dependent on the activities of lymphocytes.
E) are present at birth.
B) protect against particular threats.
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Which is most directly responsible for the falling (repolarizing) phase of the action potential?
A. The permeability to Na+ increases greatly. B. The Na+, K+ pump restores the ions to their original locations inside and outside of the cell. C. ATPase destroys the energy supply that was maintaining the action potential at its peak. D. Voltage-gated Na+ channels are opened. E. The permeability to K+ increases greatly while that to Na+ decreases.
The posterior one-quarter of the pituitary gland is called the __________.
Fill in the blank(s) with the appropriate word(s).
The ________ contains vesicles filled with acetylcholine.
A) axon terminal B) motor end plate C) neuromuscular junction D) synaptic cleft E) transverse tubule
Sympathetic stimulation causes ________.
A. erection in males and vaginal secretion in females B. ejaculation in males and vaginal secretion in females C. ejaculation in males and uterine contractions in childbirth in females D. erection in males and uterine contractions in childbirth in females