Exams › NEET › Biology

The correct route through which pulse-making impulse travels in the heart is

1. AV node → bundle of His → SA node → Purkinje fibres → heart muscles
2. AV node → SA node → Purkinje fibres → bundle of His → heart muscles
3. SA node → Purkinje fibre → bundle of His → AV node → heart muscles
4. SA node → AV node → bundle of His → Purkinje fibre → heart muscles

Correct answer: SA node → AV node → bundle of His → Purkinje fibre → heart muscles

Solution

The SA node initiates the heartbeat, so the impulse must begin there. It then passes to the AV node, travels through the bundle of His, spreads via Purkinje fibers, and finally activates the heart muscles.

Related NEET Biology questions

• Which is true about the difference between cortical and juxtamedullary nephrons?
• Which one of the following is correct?
• Erythropoiesis starts in:
• Person with blood group AB is considered as universal recipient because he has:
• Adult human RBCs are enucleated. Which of the following statement(s) is/are most appropriate explanation for this feature? (1) They do not need to reproduce (2) They are somatic cells (3) They do not metabolize (4) All their internal space is available for oxygen transport
• All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

⚔️ Practice NEET Biology free + battle 1v1 →