Category: CSIR NET Life Science Previous Year Questions and Solution on Thermoregulation

The following statements are made regarding the characteristic features of body temperature in humans: A. The core body temperature varies least with the changes of environmental temperature. B. During severe muscular exercise the rectal temperature may rise up to 400C. C. The oral temperature is relatively higher than the rectal temperature. D. The core body […]

Consider the following statements about thermoregulation in animals. A. It uses external environment to regulate internal body temperature B. It does not use external environment to regulate internal body temperature C. It can vary internal temperature considerably D. It can maintain thermal homeostasis in a narrow range of temperatures Which one of the following options […]

In fever caused by bacterial infection, the set-point of the thermoregulatory mechanism is changed to a new point above 37OC. The following statements were proposed by a researcher to explain the pathogenesis of this fever: (A) The infection induced cytokines inhibit PGE2 in the hypothalamus, and that increases the body temperature. (B) The increased levels […]

There is evidence that following pyrogenic stimuli, cytokines produced by the CNS cause fever, possibly by local release of prostaglandins. Accordingly, the following statements have been proposed: A. Cytokines act independently and directly on thermoregulatory centres B. Intrahypothalamic injection of prostaglandin receptor agonists will prevent fever C. Antipyretic effect of aspirin is exerted on the […]

The mechanisms of thermogenesis in brown adipose tissue (BAT) in cold are described in the following proposed statements: A. A thermogenic uncoupling protein, UCP1 helps in the heat production in BAT B. Norepinephrine secretion from sympathetic nerve endings in BAT is decreased C. Lipolysis is increased by low level of norepinephrine in BAT D. A […]

Humans exposed to cold climate are able to maintain their body temperature. The physiological mechanisms operating in the condition were suggested in the following statements: A. The increased thermogenesis in brown adipose tissue occurred in cold B. Uncoupling protein 1 in brown adipose tissue participated in the increased heat production C. The decreased secretion of […]

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 […]

Which one does NOT occur as a physiological adjustment during heat acclimatization? (1) Lowered threshold for start of sweating (2) Effective distribution of cardiac output (3) Improved skin blood flow (4) Increased salt concentration of sweat Understanding Physiological Adjustments During Heat Acclimatization Heat acclimatization refers to the physiological adaptations that occur when the human body […]

If the core body temperature of a human rises above normal, which of the following processes would be initiated sequentially for Thermo-regulation? (1) Peripheral vasodilation, increased rate of respiration, tachycardia. (2) Peripheral vasoconstriction, increased rate of respiration, bradycardia. (3) Peripheral vasodilation, decreased rate of respiration, tachycardia. (4) Peripheral vasodilation, decreased rate of respiration, bradycardia. Sequential […]

Which one of the following routes is responsible for maximum amount of body heat loss in humans at an ambient temperature of 210C? (1) Radiation and conduction (2) Respiration (3) Urination and defecation (4) Vaporization of sweat The Main Route of Heat Loss in Humans at 21°C Ambient Temperature The human body continuously loses heat […]