Multiple Choice QuestionsWhich one of the following is NOT secreted by capillary endothelium?
Prostacyclin
Guanosine
Endothelin
Nitric oxide
B.
Guanosine
Endothelial cells synthesize and secrete prostacyclin, endothelin, clotting factors, nitric oxide, prostaglandins, and cytokines. Vascular endothelial cells, however, lack 5-lipoxygenase and are not able to synthesize leukoterienes. Compound not metabolized by the pulmonary capillary be include epinephrine, dopamine, histamine, isoproterenol, angiotenism II, and substance P.
The "Mayer waves" in the blood pressure orginate due to:
systole and diastole of ventricle
inspiration and expiration
reflex oscilliation of neural pressure control mechanisms
Bainbridge reflex
The maturation of red blood cells does not depend on:
folic acid
vitamin B12
pyridoxine
tocopherol
Which one of the following is NOT a function of angiotenism II?
Facilitates the release of norepinephrine from post-ganglionic sympathetic neurons.
Increases the sensitivity of baroreflex by acting on brain
Produces arteriolar contraction
Increases the secretion of vasopressin
Based on the type of excretion of nitrogenous was, animals can be categorzied as ammonotelic, ureotelic and uricotelic. Given below are combinations of groups of organisms and type of excretion. Select the correct combination.
Poriferans, adult amphibians,cartilaginous fishes are ammonotelic
Ascaris, cockroaches, prawn are uricotelic
Paramecium, amphibian tadpoles, crocodiles are mainly ammonotelic
Humans, sharks and aquatic anurans are ureotelic
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