The thyroid hormone thyroxine ______
A) stimulates osteoclasts
B) increases cartilage production in the epiphyseal plate
C) stimulates replacement of cartilage with bone in the epiphyseal plate
D) removes calcium from bone
C
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How fast would the heart beat if the AV node were diseased, as occurs in total heart block?
A. More than 90 beats per minute B. An average of 75 beats per minute C. 40 to 60 beats per minute D. 20 to 40 beats per minute E. The heart rate would be very erratic and rates would fluctuate widely.
The fibrous skeleton of the heart is located
A) covering the outer surface of the heart. B) surrounding the heart valves. C) forming the atria and ventricles of the heart. D) in the wall of the pericardial sac. E) All of the answers are correct.
Aldosterone regulates the blood sodium and potassium levels.
a. true b. false
A decrease in O2 level in skeletal muscle would initiate an autoregulatory mechanism that would stimulate _________ in the arterioles supplying the muscle.
A. vasodilation B. vasoconstriction C. constriction of the precapillary sphincters D. peristaltic waves