In Himalayan rabbits, the ears, feet, and muzzle are pigmented while the rest of the body is white. This is because they express an enzyme variant that is ineffective at body temperature but functions at the lower temperatures experienced by cells of the extremities. This is an example of:

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#Question id: 16119

#Unit 7. System Physiology – Animal

Following statements are regarding to Shivering, which is the most potent mechanism for increasing heat production in the body. 

A. Cold environmental temperatures activate centers in the posterior hypothalamus during shivering, which then activate the α and γ motoneurons innervating skeletal muscle. 

B. Shivering involves skeletal muscle contracts rhythmically, generating heat and raising body temperature.

C. Shivering involves stimulation of Na+-K+ ATPase and raising body temperature.

D. Shivering involves stimulation of β receptors in brown fat, which increases metabolic rate and heat production.

Which of the following combination is correct?

TLS Online TPP Program

#Question id: 16117

#Unit 7. System Physiology – Animal

Thyroid hormones are thermogenic, their actions on target tissues result in heat production by following mechanisms:

i. stimulation of Na+-K+ ATPase

ii. increased O2 consumption

iii. increased metabolic rate

iv. increase in the number and activity of mitochondria

which of the following combinations are correct regarding heat production?

TLS Online TPP Program

#Question id: 11475

#Unit 7. System Physiology – Animal

Rods exposed to light will ________.

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#Question id: 11664

#Unit 7. System Physiology – Animal

Why are the renal artery and vein critical to the process of osmoregulation in vertebrates?

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#Question id: 11665

#Unit 7. System Physiology – Animal

Materials are returned to the blood from the filtrate by which of the following processes?

TLS Online TPP Program

#Question id: 11666

#Unit 7. System Physiology – Animal

The osmoregulatory process called secretion refers to the ________.