Waec Model Questions Vol1 2021 Biology Question 5

Practice essay / theory question 5 from the 2021 Waec Model Questions Vol1 Biology examination. This question covers Transport, Cardiovascular physiology .

Waec Model Questions Vol1 2021 Biology Essay / Theory

Topics: Transport Cardiovascular physiology

Question 5 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • essay

The circulatory system transports nutrients, gases and wastes throughout the body. In a healthy adult the heart beats at a resting rate of 72 beats per minute and each ventricular contraction ejects a stroke volume of 70 mL of blood.

Question Parts

( a )

Calculate the resting cardiac output in litres per minute.

( b )

During moderate exercise the heart rate rises to 120 beats per minute and stroke volume increases by 30 %. Determine the new cardiac output and explain how this increase meets the metabolic demands of exercising muscle tissue.

( c )

Explain how the structure of capillaries facilitates exchange of nutrients and wastes between blood and tissues. Mention at least three structural features.

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About This Question

This is Waec Model Questions Vol1 2021 Biology Question 5. It is one of the essay questions from the 2021 Waec Model Questions Vol1 Biology examination.

The question covers Transport, Cardiovascular physiology .

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