6 marksRespiration

CSEC Biology · January 2017 · Paper 2 · Question 4(b)

Suggest SIX reasons why humans who smoke heavily have less oxygen available to the cells for respiration.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

4(a)Describe how oxygen in the atmosphere becomes available to human blood for delivery to the cells, and explain how this process differs from the way plant cells…[9 marks]

More practice: the rest of this paper · more Respiration questions · all CSEC Biology past papers