Which structure regulates the body's temperature, hunger, and thirst?
The hypothalamus regulates body temperature, hunger, and thirst.
Ref: NCERT Class 11 Biology Chapter 18: Neural Control and Coordination Central Nervous System - Brain - Forebrain
#temperature regulation
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Which of the following correctly differentiates warm-blooded and cold-blooded animals?
Warm-blooded animals, more precisely endothermic homeotherms, use metabolic heat and physiological regulation to keep core temperature relatively stable across a range of environmental temperatures. Birds and mammals adjust insulation, blood flow, evaporation, shivering, and behaviour to balance heat production and loss. Cold-blooded animals are generally ectothermic, obtaining much of their heat from the environment, so body temperature and physiological rate vary more strongly with external conditions. They can still regulate behaviourally by basking or seeking shade. Hibernation is not exclusive to warm-blooded species; many ectotherms undergo seasonal dormancy, often termed brumation in reptiles. Ectotherms typically have lower, not higher, food demands because they do not continuously fuel intense thermogenesis. Body size also does not provide an absolute distinction: both groups contain small and large species. Stable internal temperature is therefore the biologically meaningful contrast among the choices. Even this distinction has exceptions. Some endotherms use torpor and become temporarily heterothermic, while large active fishes or insects may retain metabolically produced heat regionally. “Warm-blooded” and “cold-blooded” are convenient labels, but endothermy, ectothermy, homeothermy, and poikilothermy describe mechanisms more precisely.
Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10
Heat conductance increases approximately how many times from vasoconstriction to vasodilation?
The correct answer is D: Eightfold. In Thermoregulation, this idea is central because it matches how the body actually works in everyday teaching examples. Put simply, Eightfold is the option that correctly names the structure, process, or principle asked for in Thermoregulation. That is why Eightfold is the option that holds up when you check it against basic physiology. When you revise, say the answer out loud with one short reason attached; that sticks better than rote lists. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
Heat conductance from core to skin increases maximum during:
Pick B: Vasodilation. Thinking about Thermoregulation in a practical way — what the structure does, or what the process achieves — leads you here. Clinically and academically, the same logic shows up again and again: Vasodilation is the option that correctly names the structure, process, or principle asked for in Thermoregulation. Hence Vasodilation is correct. Treat this as a building block for the rest of Thermoregulation; neighbouring topics often reuse the same principle. Keep a one-line summary card for this idea and revisit it before the paper; short, repeated review beats long cramming sessions. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Vasodilation.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
Warm receptors are activated mainly between temperatures of:
Go with C — 30–45°C. Within Thermoregulation, that statement lines up with the standard definition and the usual exam wording you’ll see. In plain terms, the functional job described in the stem is exactly what 30–45°C does in Thermoregulation. Holding that picture in mind makes 30–45°C feel natural rather than something you only memorise. Link the term to a real body example (organ, tissue, or ion flow) so the idea stays concrete under exam pressure. A short mental diagram helps — start from stimulus or structure, follow the pathway, and stop at the functional result described by 30–45°C. In class notes, highlight this same phrase next to the related diagram so the wording and the picture reinforce each other.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.