What is the normal discharge rate of the S-A node in times/min?
Understand the Problem
The question is asking for the normal discharge rate (firing rate) of the sinoatrial (S-A) node, which is expressed in beats per minute. The answer choices provided indicate different ranges of discharge rates.
Answer
60 to 100 times per minute.
The normal discharge rate of the sinoatrial (SA) node is 60 to 100 times per minute.
Answer for screen readers
The normal discharge rate of the sinoatrial (SA) node is 60 to 100 times per minute.
More Information
The SA node, known as the pacemaker of the heart, sets the rhythm for heartbeats by initiating the electrical impulses that cause the heart to contract, maintaining a normal sinus rhythm.
Sources
- Physiology, Sinoatrial Node - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Sinus Node Dysfunction - UCSF Benioff Children's Hospitals - ucsfbenioffchildrens.org
- Sinoatrial node - Wikipedia - en.wikipedia.org
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