This portion of the blastocyst forms the embryo proper
A) inner cell mass (ICM)
B) morula
C) zona pellucida
D) trophoblast
Answer: A) inner cell mass (ICM)
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Atrial natriuretic hormone is named for its main effect which is to
A. increase sodium excretion in the urine. B. cause the binding of sodium to urea in the blood. C. increase the absorption of sodium by heart muscle cells. D. decrease sodium excretion in perspiration.
Up-regulation
A. is found in target cells that maintain a constant level of receptors. B. moves the receptors up on the membrane. C. produces an increase in the sensitivity of the target cell to the hormone. D. produces insensitivity to the hormone in the target tissue. E. results in a decrease in the number of receptor sites in the target cell.
Distortion of hair cells in the cochlea causes
A. initiation of action potentials in CN VI. B. bending of the basilar membrane. C. movement of the tympanic membrane. D. initiation of action potentials in CN VIII.
The major site of sympathetic blood flow control (resistance changes) is at the
a. arterioles b. capillaries c. metarterioles d. arteries e. veins