Question

QUESTION 2; Assess your understanding of heartbeat regulation by completing each sentence. Then, drag and drop the sentences in the correct order based on which one comes first.

The impulse is then picked up by the  ____________  in the right atrium.

This impulse from the pacemaker causes the atria to  ____________ .

The SA node is found in the right atrium and is also called the pacemaker.

The AV node then passes the impulse to fibers that cause the  ____________  to contract.

The heart beats regularly due to impulses sent out by the  ____________ .

WORD BANK; VENTRICLES, SEPTUM, SA NODE, DEALMAKER, AV NODE, PACEMAKER, RELAX, CONTRACT

Answer 1

Ans)

1. The SA node is found in the right atrium and is also called the pacemaker.
2. The heart beats regularly due to impulses sent out by the  _____SA node____ .
3. The impulses from the pacemaker causes the atria to contract.
4. The impulse is then picked up by the  ______AV node______  in the right atrium.
5. The AV node then passes the impulse to fibers that cause the  ________Ventricles____  to contract.

Explaination:- Heart beat impuse conduction pathway:-

SA node present in the right atrium and it is called pacemaker as it is autoexcitable and it produces action potential (impulse) =72times/minute.

The impuse from SA node causes contraction of both atria and then impulse is picked by AV node (Pacesetter) that is present at the base of interauricular septum towards right side.

The A V node passes impulse to bundle which passes to purkinje fibres that causes contraction of both ventricles.