In response to excessive amounts of hormone, a target cell may reduce its number of receptors for that hormone. This is an example of
A. increasing specificity to a hormone.
B. up-regulation.
C. down-regulation.
D. increasing sensitivity to a hormone.
Answer: C
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When you stand for a long period of time, why should you "lock" your knee in extended position? How does the knee lock?
What will be an ideal response?
Norepinephrine (NE) is released from sympathetic fibers in response to a sudden drop in mean arterial pressure (MAP). What does NE do to help return MAP to normal?
A. NE release increases total peripheral resistance leading to an increase in MAP B. NE acts on cells of the SA node to increase contractility C. NE release at ventricular cells increases the force of contraction and decreases the duration of systole D. NE stimulates the release of epinephrine from the adrenal medulla E. NE released at the SA node increases the slope of the pacemaker potential F. NE causes vasodilation of many arterioles leading to increased MAP
A lesion in the left inferotemporal cortex would most likely lead to reduced:
A. face recognition in the right visual field B. motion discrimination in the right visual field C. color discrimination in the left visual field D. motion discrimination in the left visual field E. face discrimination in the left visual field
Enzymes catalyze degradation reactions but not synthesis reactions.
Answer the following statement true (T) or false (F)