What would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst?:
a. The cells would not continue to divide.
b. The corpus luteum would continue to produce progesterone and estrogen.
c. Menses would flush the blastocyst out of the uterus.
d. The uterine mucosa would not envelop the blastocyst.
Ans: c. Menses would flush the blastocyst out of the uterus.
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An action potential does not re-stimulate the adjacent membrane that was previously depolarized because
A. stimulation is inhibited by the myelin sheath. B. that area of the membrane is in the absolutely refractory period. C. the resting membrane potential of the axon is too negative. D. the resting membrane potential of the axon is too positive. E. it is impossible for an action potential to be propagated along an axon toward the nerve cell body.
The pulmonary circuit
A) sends oxygen-poor blood to the heart. B) sends oxygen-poor blood to the tissues. C) brings oxygen-rich blood from the tissues. D) sends oxygen-poor blood to the lungs.
Hypoxemia is
A) excess carbon dioxide in the blood B) deficiency of oxygen in the blood C) excess oxygen in the tissues D) excess oxygen in the blood
When should the basal metabolic rate be measured?
A) When a person is engaged in normal physical activity but not strenuous exercise B) When a person has just eaten a meal of no more than 2000 kcal C) When a person first rises in the morning D) When a person is sleeping E) When a person is in the absorptive state