Ijmb Model Questions Vol1 2025 Biology Question 7

Practice essay / theory question 7 from the 2025 Ijmb Model Questions Vol1 Biology examination. This question covers Homeostasis .

Ijmb Model Questions Vol1 2025 Biology Essay / Theory
Topic: Homeostasis
Question 7 IJMB_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • essay

A researcher is studying how the human body maintains internal stability when exposed to varying environmental conditions.

Question Parts

( a )
Define homeostasis and state the two principal types of feedback mechanisms that regulate it.
( b )
The subject is placed in a cold environment (5 °C) for 30 minutes. Explain the physiological responses that are activated to preserve core body temperature. In your answer identify the primary sensor, the integrating centre and the effectors, and describe both neural and hormonal components of the response.
( c )
During the same experiment the subject receives an intravenous infusion of 5 % dextrose, raising blood glucose by 2 mmol L⁻¹. Discuss how glucose homeostasis is restored, outlining the sequence of events, the role of insulin, and how negative feedback operates. Compare the time scales of the neural response described in part (b) with the hormonal response in this part.

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About This Question

This is Ijmb Model Questions Vol1 2025 Biology Question 7. It is one of the essay questions from the 2025 Ijmb Model Questions Vol1 Biology examination.

The question covers Homeostasis .

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