logo

Exam-style practice

Heart answer explanations

Review worked answers and explanations for Heart. Aligned to Cambridge IGCSE Biology.

Answer explanations

Question 20 of 22

Review the answer support, then move sideways through the set.

Showing nearby questions. Use Previous and Next to move through all 22 questions.

Paper 4 structured question: Heart

Paper 4Theory (Extended)3 marks

Description

Heart Pumping Action

The heart has atrial and ventricular muscles that contract in sequence. Valves between chambers and at exits prevent backflow.

  1. a

    Identify which muscles contract first during the heart cycle.

    [1]
  2. b

    Describe how the valves help blood flow through the heart.

    [2]
Next →