The link between the hypothalamus, pituitary gland, and some endocrine glands—in which low levels of hormone signal the hypothalamus to secrete more releasing factor, which in turn signals the pituitary gland to secrete stimulating hormones, resulting in increased hormone levels—is called a
a. feedback stimulation mechanism
b. negative feedback loop.
c. positive feedback loop.
d. connected feedback loop.
.B
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In a ________ muscle, the fascicles are concentrically arranged around an opening
A) convergent B) parallel C) straight D) pennate E) circular
The depolarization phase of the action potential is due to
A) Na+ ions moving into the cell. B) K+ ions moving into the cell. C) Na+ ions moving out of the cell. D) K+ ions moving out of the cell. E) both A and B.
The majority of carbon dioxide is transported:
A) as the bicarbonate ion. B) as carbonic acid. C) dissolved in plasma. D) as carbaminohemoglobin.
A renal corpuscle includes the
A) glomerular capsule and renal tubule. B) glomerulus and glomerular capsule. C) renal tubule and collecting tubule. D) glomerulus and renal tubule.