Which of the following structures sets the pace of heart contraction?
atrioventricular bundle
SA node
bundle branches
AV node
SA node
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An example of a partial but sustained contraction is
A) eye blinking. B) knee jerking. C) a twitch. D) muscle tone.
Which variables affect the filtration coefficient? select all that apply.
a) the amount of sodium in the blood b) permeability of the filtration membrane c) the level of hydration d) the surface area available for filtration
Which of the following best describes nerve signals?
A. They travel at the same speed in all nerve fibers. B. They travel fastest in small myelinated fibers. C. They travel fastest in small unmyelinated fibers. D. They travel fastest in large unmyelinated fibers. E. They travel fastest in large myelinated fibers.
Which of the following is NOT a homeostatic function of the kidneys?
A. Maintenance of acid-base and water-salt balances B. Maintenance of blood pressure C. Excretion of metabolic wastes D. Elimination of digestive wastes