If five action potentials arrive at the same synapse in very close succession, which of the following would occur?
A. The direction of the action potential is reversed.
B. Temporal summation occurs.
C. Spatial summation occurs.
D. Hyperpolarization occurs.
E. Depolarization always occurs.
B
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Parietal cells, chief cells, and G cells compose the
A) gastric pits. B) rugae. C) villi. D) gastric glands. E) small intestine
The following has been determined from an arterial blood gas (ABG) sample: an elevated blood pH and an elevated bicarbonate ion level. Determine the acid-base imbalance
A) metabolic acidosis B) respiratory alkalosis C) metabolic alkalosis D) respiratory acidosis
The figure illustrates the parasympathetic division. What does "A" represent?
A. preganglionic neurons B. pelvic splanchnic nerves C. cranial nerves D. postganglionic neurons E. terminal ganglia
Which of these effectors is NOT directly controlled by the autonomic nervous system?
A) most glands B) smooth muscle C) cardiac muscle D) skeletal muscle