Indicate an advantage for having simple rather than stratified epithelium lining the gas-exchange surfaces of the lungs
The epithelia are thin, keeping diffusion distance between blood and airspaces to a minimum. This speeds gas exchange across the layers.
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Which correctly describes renin?
A. It acts on the adrenal cortex to stimulate aldosterone secretion. B. Its secretion is stimulated by elevated blood pressure in the renal afferent arterioles. C. Its secretion is enhanced by high levels of Na+ in the macula densa. D. It is secreted by juxtaglomerular cells in renal afferent arterioles. E. It is secreted by the liver in response to low blood pressure.
Calcitonin causes:
a. an increase in the blood concentration of calcium b. a breakdown in the bone matrix c. a decrease in the blood concentration of calcium d. both A and B above
Afferent arteriolar vasoconstriction ____ blood flow into the glomerulus, which causes the glomerular-capillary blood pressure to ____, leading to a(n) ____ in the net filtration pressure and a resultant ____ in the GFR
a. increases; increase; increase; increase b. decreases; decrease; decrease; decrease c. increases; increase; decrease; decrease d. decreases; decrease; increase; increase e. none of these
Recognition of your best friend's face is a function of ________ cerebral hemisphere(s).
A. the right B. both C. the left