Advanced Animal Physiology and Endocrinology MCQ

Which one of the following is NOT involved with the absorption of iron in the intestine? (CSIR_2017_II)

In which one of the body fluids is K+ concentration higher than that of Na+? (CSIR_2017_II)

A visitor to a region of hot climate is more distressed by the heat than the regular resident. Within a few weeks, the visitor is more comfortable with the heat and capacity for work is increased. Following are some of the explanations given by a researcher regarding acclimatization to heat.

(A). Sweating begins at a lower body temperature
(B). Blood flow through skin is high for any body temperature
(C). There is rise in resting body temperature
(D). Vasoconstriction starts at a lower body temperature

Which one of the following is NOT true? (CSIR_2015_II)

The difference in circulation between glo-merular capillaries (GC) and true capillaries (TC) are described by a researcher in the following statements:

(A). The hydrostatic pressure in GC is higher than that in TC
(B). The endothelial cells are fenestrated in GC but not in TC
(C). Both filtration and fluid movement into capillary takes place in TC but only filtration occurs in GC.
(D). The plasma colloid osmotic pressures in both the ends of GC or TC are similar.

Which one of the following is NOT correct? (CSIR_2015_II)

When rods of retina kept in dark, were exposed to light, photo-transduction occurred. Following are some explanations given by a researcher regarding photo-transduction:

(A). Activation of transducin
(B). Inhibition of cGMP phosphodiesterase
(C). Closure of Na+ channels
(D). Hyperpolarization of rods

Which one did NOT occur in photo-transduction? (CSIR_2015_II)

The afferent nerve fibres of a stretch reflex were electrically stimulated and the contraction of the muscle innervated by efferent fibres was recorded. The synaptic delay was calculated from the time points of the nerve stimulation and response of the muscle. Which one of the following time durations will be probable value for the observed synaptic delay? (CSIR_2015_II)

Patients suffering from familial hypercholesterolemia (FH) are mostly homozygous for the defective gene and have profoundly elevated levels of serum cholesterol. The reason may be that the gene for high specific receptor for LDL is either defective or missing in these patients. In an experiment, cells were taken from both normal individual and homozygote (FH) subjects, incubated in buffer with 125^I labeled LDL in presence or absence of excess unlabeled LDL for various time periods and then 125^I labeled LDL bound to cells? (CSIR_2015_I)

Upon prolonged illumination, activated rhodopsin does not activate transducin, hence the vision is impaired. This could be because of the following explanations:

(A). Most of the activated rhodopsin gets phosphorylated and is unable to activate transducin.
(B). Most of the activated rhodopsin gets dephosphorylated and is unable to activate transducin.
(C). Arrestin further interacts with phosphorylated rhodopsin
(D). Arrestin further interacts with dephosphorylated rhodopsin.

Which of the above combinations is correct? (CSIR_2015_I)

A diabetic patient developed metabolic acidosis resulting in deep and rapid breathing which is called: (CSIR_2015_II)

An elderly person suffering from calcium deficiency was advised to take calcium rich food and to supplement the diet with vitamin D. The absorption of calcium in the intestine was increased with the supplementation of vitamin D. Following explanations were offered for this increased calcium absorption by vitamin D:

(A). The synthesis of calbindin-D9k and calbindin-D28k in enterocytes was stimulated
(B). The number of Ca^2+-ATPase molecules in enterocytes was increased
(C). The synthesis of divalent metal transporters I (DMT1) in the enterocytes was stimulated
(D). The number of hephaestin in the enterocytes was increased.

Which of the above combinations is correct? (CSIR_2015_I)