ExpertEasy1 markMultiple Choice
AQA GCSE · Question 02.3 · Organisation
A group of cells called the pacemaker controls the resting heart rate. Where in the heart is the pacemaker found?
A group of cells called the pacemaker controls the resting heart rate. Where in the heart is the pacemaker found?
Answer options:
A.
Left atrium
B.
Left ventricle
C.
Right atrium
D.
Right ventricle
How to approach this question
Recall the specific location of the sinoatrial node (SAN), which acts as the natural pacemaker of the heart. It is located in the wall of one of the receiving chambers.
Full Answer
C.Right atrium✓ Correct
Right atrium
The natural pacemaker of the heart is a small group of specialised cells called the sinoatrial node (SAN). It is located in the wall of the right atrium. The SAN generates electrical impulses that spread across the atria, causing them to contract. The impulse then travels to the ventricles, causing them to contract. This coordinated process results in a heartbeat.
Common mistakes
✗ Choosing any chamber other than the right atrium.
✗ Confusing the pacemaker's location with the atrioventricular node (AVN), which is located between the atria and ventricles.
Practice the full AQA GCSE Biology Higher Tier Paper 1
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