How does a buffer help a solution maintain pH?
A. A buffer releases a base to neutralize an acid.
B. A buffer forms both cations and anions to counteract acids.
C. A buffer releases acid to maintain proper pH.
D. A buffer can act like a base if pH is acidic, and it can act like an acid if pH is basic.
Answer: D
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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.
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Answer the following statement true (T) or false (F)