Igcse Model Questions Vol1 2020 Biology Question 7

Practice essay / theory question 7 from the 2020 Igcse Model Questions Vol1 Biology examination. This question covers Homeostasis, Thermoregulation, Fluid balance .

Igcse Model Questions Vol1 2020 Biology Essay / Theory

Topics: Homeostasis Thermoregulation Fluid balance

Question 7 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay

A 20‑year‑old male student goes for a 2‑hour jog on a hot day. The ambient temperature is 35 °C and the relative humidity is 60 %. While jogging he sweats at a rate of 0.8 L h⁻¹. His total body water is 42 L.

Question Parts

( a )

Describe the physiological mechanisms that act to prevent his core body temperature from rising excessively during the jog.

( b )

i) Calculate the percentage of his total body water lost after the 2‑hour jog. ii) Discuss how this loss could affect blood pressure and the operation of the cardiovascular component of homeostasis.

( c )

Explain how the kidneys contribute to restoring water balance after the exercise, mentioning the role of antidiuretic hormone (ADH).

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About This Question

This is Igcse Model Questions Vol1 2020 Biology Question 7. It is one of the essay questions from the 2020 Igcse Model Questions Vol1 Biology examination.

The question covers Homeostasis, Thermoregulation, Fluid balance .

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