Igcse Model Questions Vol1 2023 Biology Question 5

Practice essay / theory question 5 from the 2023 Igcse Model Questions Vol1 Biology examination. This question covers Transport .

Igcse Model Questions Vol1 2023 Biology Essay / Theory
Topic: Transport
Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • essay

The transport of substances in the human circulatory system is essential for maintaining homeostasis.

Question Parts

( a )
Define cardiac output and state how it is calculated.
( b )
During rest a person's cardiac output is 5 L min⁻¹ and the arterial oxygen content is 0.20 L O₂ per litre of blood. During moderate exercise the cardiac output rises to 12 L min⁻¹ and the arterial oxygen content falls to 0.18 L O₂ per litre. Assuming all delivered oxygen is used by the tissues, calculate the rate of oxygen consumption at rest and during exercise and state the percentage increase in oxygen consumption.
( c )
Explain why oxygen consumption increases during exercise even though the arterial oxygen content per litre of blood falls.
( d )
A blockage in a coronary artery reduces blood flow to a region of the heart by 30 %. Discuss two possible consequences for the affected cardiac tissue.

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About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 5. It is one of the essay questions from the 2023 Igcse Model Questions Vol1 Biology examination.

The question covers Transport .

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