An example of a "short loop" feedback is:
A. GH inhibition of GHRH
B. cortisol inhibition of ACTH
C. FSH inhibition of LH
D. estrogen inhibition of GnRH
E. somatostatin inhibition of GH
ANS: A
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Chromosomes are pulled by spindle fibers to opposite sides of the cell during:
a. interphase b. prophase c. anaphase d. telophase
What is the function of calcium in the production of an action potential?
A. Release of acetylcholine B. Opening of chemically gated sodium channels C. Inactivation of potassium channels D. Return of neuron to resting state
Which of the following is NOT consistent with active transport?
A. Movement is with a concentration gradient B. Uses cell energy C. Movement is against a concentration gradient D. Involves a carrier E. Exhibits competition and saturation
In response to rising blood calcium levels, the parafollicular cells of the thyroid will secrete which hormone?
A) Calcitonin B) Parathyroid hormone C) T3 D) T4