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Edexcel IGCSE Biology 2.65 The Heart and How It Functions Questions

Use heart diagrams to identify its chambers, septum and semilunar valves. Explain how pressure, muscular wall thickness and valve action direct blood through the lungs and the rest of the body.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • Identify heart chambers, the septum and semilunar valves on a diagram.
  • Compare the thickness and muscle of the right and left ventricular walls, linking them to the pressure and route of blood pumped to the lungs or body.
  • Explain how heart valves maintain one-way blood flow by preventing backflow into the ventricles.

Edexcel IGCSE Biology 2.65 The Heart and How It Functions Questions question 1

[Maximum number: 6]

Aerobic respiration uses oxygen and produces ATP.

Question (a)

(a)

The structure of a frog heart is different from the structure of a human heart.

The diagram shows a section of a frog heart with arrows showing the direction of blood flow.

Figure for Question (a) — Edexcel IGCSE Biology
[ 6 ]

Question (i)

(i)

Give one difference between the structure of the frog heart and a human heart.

[ 1 ]

Question (ii)

(ii)

Humans can run for long periods of time. Frogs can only move for short periods of time.

Explain how the structure of the heart of a frog means that it is unable to move for long periods of time.

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