Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 93 Marks
Question
What are SA and AV nodes? What are their functions?
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Answer
SA-Node. It is a pacemaker located at the right wall of right auricle/atrium. Its full name is a sinoatrial node. AV-Node. It is a pacesetter located at the junction of auricle and ventricle. Its full name is an auriculoventricular node. Functions of SA-Node: i. Cardiac impulse originates in it. ii. It determines the rate of heartbeat. Function of AV-Node: i. The Cardiac impulse passes to the AV bundle through the AV Node. ii. Its branches called purkinje fibres conduct impulses to ventricles.
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