Multiple Choice QuestionsWhich one of the following is NOT secreted by capillary endothelium?
Prostacyclin
Guanosine
Endothelin
Nitric oxide
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
D.
tocopherol
Erythropoiesis is the process which produces red blood cells(erythrocytes). It is stimulated by decreased O2 in circulation, which is detected by the kidneys, which then secrete the hormones erythropoietin.
Essential for the maturation of red blood cells are vitamin B12 and Vitamin B9. Lack of either causes maturation failure in the process of erythropoiesis, which manifest clinically as reticulocytopenia, an abnormally low amount of reticulocytes.
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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