As ventricular systole begins, all four heart valves are closed during the:
A) isovolumetric contraction phase.
B) ventricular ejection phase.
C) isovolumetric relaxation phase.
D) ventricular filling phase.
Answer: A
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Portion of the nephrons attached to the collecting duct
A) proximal convoluted tubule
B) medullary portion of the collecting duct
C) distal convoluted tubule
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