Which of the following statements about the Na+/K+ pump is FALSE?
A) Its activity requires the expenditure of metabolic (cellular) energy.
B) It transports Na+ and K+ in a 1:1 ratio.
C) It is present in neurons.
D) It transports Na+ out of the cell and K+ into the cell.
B) It transports Na+ and K+ in a 1:1 ratio.
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Excitation of the vasomotor center results in
A. increased sympathetic activity and predominantly more vasoconstriction than vasodilation. B. increased parasympathetic activity and predominantly more vasodilation than vasoconstriction. C. increased autonomic activity that increases heart rate and dilates blood vessels. D. decreased autonomic activity that decreases heart rate and constricts blood vessels. E. redistribution of blood flow away from the skeletal muscles and toward the skin.
Which area of a sarcomere only contains thick filaments?
A) H band B) I band C) A band D) zone of overlap
Which type of cell repairs damaged alveolar epithelium?
A. Goblet cells B. Great (type II) alveolar cells C. Squamous (type I) alveolar cells D. Alveolar macrophages E. T lymphocytes
Which are ways that water leaves the body? Choose all that apply.
A. Exhalation B. Feces C. Sweat D. Most metabolic processes use up water