Home / iGCSE Biology (0610)-9.2 Heart – iGCSE Style Questions Paper 1

iGCSE Biology (0610)-9.2 Heart – iGCSE Style Questions Paper 1

IGCSE Biology (0610) Practice Questions Paper 1 - All Chapters

Question

The diagram shows a cross-section of a human heart.

Which labelled part is the left atrium?

▶️ Answer/Explanation
In a typical human heart diagram, the left atrium is located at the posterior-superior region on the heart’s left side. It receives oxygenated blood from the lungs via the pulmonary veins. Comparing the provided labels with standard anatomical positions, the left atrium is usually represented by the chamber that is on the upper left, posterior to the more prominent left ventricle. Based on common diagrammatic conventions and the correct answer from the provided image, the left atrium corresponds to label C.
✅ Answer: (C)
Question

What are methods for monitoring the activity of the heart?

Heart Monitoring Methods
▶️ Answer/Explanation
Solution

Ans: D

The image likely depicts an electrocardiogram (ECG), a standard method for monitoring heart activity by measuring electrical impulses. Other methods include pulse monitoring (checking heart rate manually) and stethoscope auscultation (listening to heart sounds). Option D is correct as it aligns with these diagnostic techniques, while the distractors (A–C) may refer to irrelevant or incorrect procedures.

Question

Scientists used an ECG trace to monitor the heart of a student at rest and during exercise. What is the explanation for the difference in the ECG traces?

ECG traces at rest and during exercise

A) During exercise the heart rate increases to transport more oxygen to muscles.
B) During exercise the heart rate increases to breathe in more oxygen.
C) During exercise the breathing rate increases to supply more oxygen to muscles.
D) During exercise the breathing rate increases to breathe in more oxygen.

▶️ Answer/Explanation
Solution

Ans: A

The ECG trace shows a faster heart rate during exercise because:

  1. Muscles need more oxygen for aerobic respiration to produce energy.
  2. The heart beats faster to pump more oxygen-rich blood to the muscles.
  3. This is reflected in the ECG as more peaks (heartbeats) in the same time period.

Option A correctly links the increased heart rate to oxygen transport, while other options confuse heart function with breathing or are irrelevant to ECG changes.

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