16) in a normal healthy person an increase in cardiac output will decrease: a) t
ID: 260903 • Letter: 1
Question
16) in a normal healthy person an increase in cardiac output will decrease: a) the size of zone 3 in the lung, b) systemic arterial pressure, c) pulmonary vascular resistance, d) pulmonary arterial pressure, e) venous return
17) mean arterial pressure readings over three months are between 90 and 100 mmHg for patient X and between 150 and 160 for patient Y. A rapid decrease in carotid sinus pressure would: a) decrease in parasympathtic nerve activity about equally in both patients, b) increase plasma renin activity only in patient Y, C) increase sympathetic and decrease parasympathetic nerve activity only in patient x, d) decrease both sympathetic and parasympathetic nerve activity only in patient x, e) stimulate the chemoreceptor reflex in both patients
18) total spinal anesthesia reduces blood pressure: a) vasopressin secretion falls to zero, b) parasympathetic nerve activity to the heart is eliminiated, c) activity in the arterial baroreceptor afferents is reduced, d) sympathetic nerve activity to the vaculature and heart is eliminated, e) the arterial baroreceptors afferents are not functioning
19) nitric oxide: a) is a potent vasodilator, b) all of the above, c) is generated by endothelial cells, d) is freely permeable to cell membranes, e) activates cyclic GMP is vascular smooth muscle cells
20) if hemorrhage causes precapillary resistance arterioles to constrict and capillary hydrostatic pressure decreases, which of the following is most likely to occur: a) net absorption of fluid in the capillaries will increase, b) capillary diameter will decrease, c) capillary diameter will increase, d) net absorption of fluid in the capillaries will not change, e) net filtration of fluid from the capillaries will increase
Explanation / Answer
Answer: -
16. The correct option is C. Pulmonary Vascular Resistance will decrease with increase in cardiac output due to the recruitment and the distension of the pulmonary vessels
17. The correct option is A. Decrease parasympathetic nerve activity about equally in both patients
18. The correct option is D. Sympathetic nerve activity to the vasculature and heart is eliminated.
19. The correct option is B. All of the above. Metabolism of arginine in the endothelium of blood vessels produces nitric oxide. Nitric oxide diffuses to the underlying vascular smooth muscle and stimulates cyclic GMP that in turn causes activation of various cellular mechanisms that lead to smooth muscle relaxation and vasodilation.
20. The correct option is A. Net absorption of fluid in the capillaries will increase.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.