Which phase of the action potential represents the nonrefractory period?

a. last half of Phase 3 c. Phase 4
b. first half of Phase 3 d. Phase 5


c. Phase 4

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Which of the following is associated with acute cardiac muscle weakness and potential cardio-pulmonary failure?

a. Hyperkalemia b. Hypophosphatemia c. Hypernatremia d. Low folic acid levels

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The ____ is the protective sac around the embryo. 

A. yolk sac B. amnion C. umbilical cord D. mesoderm E. ectoderm

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The smallest known infectious agent, consisting only of nucleic acid surrounded by a protein coat, is a(n) ________. 

Fill in the blank(s) with the appropriate word(s).

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Most lawsuits brought by patients are the result of poor interpersonal relationships with health care workers

a. True b. False Indicate whether the statement is true or false

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