Neco Model Questions Vol1 2020 Biology Question 5

Practice essay / theory question 5 from the 2020 Neco Model Questions Vol1 Biology examination. This question covers Transport, Circulatory system, Cardiovascular physiology .

Neco Model Questions Vol1 2020 Biology Essay / Theory
Topics: Transport Circulatory system Cardiovascular physiology
Question 5 NECO_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay

The human circulatory system transports gases, nutrients, hormones and waste products between the external environment and body cells.

Question Parts

( a )
Explain how the structure of capillaries facilitates exchange of nutrients and waste between blood and surrounding tissues.
( b )
The average adult cardiac output is 5 L min⁻¹. Blood contains 0.2 % dissolved oxygen by volume. Calculate the volume of oxygen (as a gas at STP) delivered to the tissues each minute.
( c )
During intense exercise cardiac output rises to 20 L min⁻¹ and muscle oxygen extraction increases from 25 % to 40 % of the oxygen delivered. Calculate the increase in the amount of oxygen extracted per minute compared with rest.
( d )
Discuss two physiological adaptations that improve the efficiency of transport during prolonged physical activity.

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About This Question

This is Neco Model Questions Vol1 2020 Biology Question 5. It is one of the essay questions from the 2020 Neco Model Questions Vol1 Biology examination.

The question covers Transport, Circulatory system, Cardiovascular physiology .

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