A drop in blood Ca++ will indirectly increase renal 1? hydroxylase activity. This occurs in response to:
A. elevated 25-hydroxyvitamin D
B. elevated PTH
C. elevated Pi
D. elevated calcitonin
E. elevated 24-hydroxylase activity
ANS: B
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Gray matter refers to regions of the central nervous system composed primarily of densely packed cell bodies, whereas white matter consists of bundles of myelinated nerve fibers
Indicate whether the statement is true or false
How is most of the carbon dioxide transported by the blood in humans?
A) bicarbonate ions in the plasma B) CO2 attached to hemoglobin C) carbonic acid in the erythrocytes D) CO2 dissolved in the plasma E) bicarbonate attached to hemoglobin
The relaxation phase of the lower chambers of the heart is called
A) ventricular systole. B) ventricular diastole. C) atrial systole. D) atrial diastole. E) None of the answers aer correct.
As an arterial pathway moves farther from the heart, the arteries
A. get larger. B. get smaller. C. show no change in their lumen size.