Cambridge International A Level · Biology (9700)

Transport in mammals: Practice Questions

5 multiple-choice questions marked as you go, and 2 written questions with worked solutions. All on Transport in mammals.

7 questions18 marksFree, no account

Question 1

1 mark

Which type of white blood cell is characterised by a large, spherical or slightly indented nucleus that occupies most of the cell and produces antibodies during an immune response?

Question 2

1 mark

What causes the atrioventricular (AV) valves to close during the mammalian cardiac cycle?

Question 3

1 mark

Why is there a critical delay of approximately \(0.1\text{ s}\) at the atrioventricular node (AVN) before the electrical excitation spreads down the Purkyne tissue to the ventricles?

Question 4

1 mark

Which enzyme inside red blood cells catalyses the reversible conversion of carbon dioxide and water into carbonic acid?

Question 5

1 mark

During electrical coordination of the mammalian heart, why is there an essential delay in the transmission of the electrical impulse at the atrioventricular node (AVN)?

Question 6

6 marks

Describe the key events during ventricular systole in the human cardiac cycle, including changes in blood pressure, valve actions, and the resultant blood flow.

Write your answer out first, then check it against the worked solution.

Question 7

7 marks

The mammalian heart is a highly efficient pump that ensures continuous blood flow throughout the body.

(a) Describe the sequence of events that occurs during one complete cardiac cycle, referring to pressure changes and valve actions.

(b) Explain how the sinoatrial node (SAN) and atrioventricular node (AVN) coordinate the contractions of the heart chambers.

Write your answer out first, then check it against the worked solution.

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