During the time period immediately following an action potential, a neuron can produce another action potential only ________
A) if the neuron is stimulated again normally
B) when the neuron remains very permeable to Na+
C) if the neuron receives an especially strong stimulus
D) when the neuron is impermeable to K+
Answer: C
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When small blood vessels are damaged, loss of blood is prevented by
a. platelet aggregation. b. vasoconstriction of these vessels. c. formation of a platelet plug. d. all of these answers. e. none of these answers.
Hypersecretion of which of the following hormones causes increased metabolic rate, sensitivity to heat, weight loss, and exophthalmos?
A. Cortisol B. Estrogen C. GH (growth hormone) D. Thyroid hormone E. PTH (parathyroid hormone)
The force that causes water and solutes to cross cell membranes by filtration is ________
A) hydrostatic pressure B) kinetic energy of molecules C) a concentration gradient D) energy provided by ATP
What is the falciform ligament?
A) dorsal mesentery of the stomach B) dorsal mesentery of the small intestine C) remnant of the ventral mesentery between the liver and the anterior wall of the peritoneal cavity D) remnant of the ventral mesentery between the stomach and the liver E) dorsal mesentery of the large intestine