Cambridge IGCSE Combined Science practice

Paper 4 structured question: Gas exchange in humans

Try the question first, then check the answer and practise the same topic again.

At a glance

Paper

Marks

Topic

Gas exchange in humans

Exam-style question

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Paper 4Theory (Extended)2 marks

Gas exchange in humans is vital for respiration.

Description

Gas exchange surfaces in humans have several important features that facilitate efficient gas exchange.

a
Explain the importance of having a large surface area in gas exchange surfaces.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 4Theory (Extended)4 marks

Description

Gas exchange surfaces must be thin, well-vascularized, and ventilated to function effectively.

a
Discuss the characteristics of gas exchange surfaces and their roles in efficient gas exchange.
Your answer
Aim for approximately 4 distinct marking points.
[4]