If the cusps of an atrioventricular valve are damaged or functionally impaired so that they do not close completely during the normal point in the cardiac cycle, blood may flow backwards. This is called ________.
A) ischemia
B) regurgitation
C) thrombosis
D) automaticity
E) nodal depolarization
Ans: B) regurgitation
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The ________ of a radioactive substance is the time required for 50 percent of a given amount of radioisotope to decay
A) decay-point B) mid-life C) deterioration point D) half-life E) entropy
Which of the following is the mechanism in which skeletal muscles assist venous return of blood to the heart?
A. Cardiac suction B. Gravity C. Contraction of limb muscles D. Pressure gradient
The amount of ADH that is secreted by the posterior pituitary glands varies with
a) blood osmotic pressure. b) blood calcium levels. c) blood oxygen levels. d) blood glucose levels. e) All of these choices.
During quiet breathing, expiration does not require muscle contraction but inspiration does.
Indicate whether the statement is true or false.