At What Rate Does the Sinoatrial Node Depolarize?

James H. Sterling
James H. Sterling
• • 7 min read

At Rest, the Sa Nodal Sa Nodal the Sinoatrial Nodal Artery Is a Branch of the Main Coronary Arteries, or Its Derivatives, Which Supplies Blood to the Pacemaker...

At What Rate Does the Sinoatrial Node Depolarize?

At rest, the SA nodal

SA nodal
The sinoatrial nodal artery is a branch of the main coronary arteries, or its derivatives, which supplies blood to the pacemaker of the heart, the sinoatrial node. It can also supply blood to the crista terminalis and the free walls of both the left and right atrium.
myocytes depolarize at an intrinsic rate between 60 and 100 beats per minute, which is generally considered a normal heart rate. The autonomic nervous system tightly controls input into the sinus node.

At what rate does the sinoatrial SA node depolarize quizlet?

At what rate does the sinoatrial (SA) node depolarize? The sinoatrial node typically depolarizes spontaneously about 75 times per minute, although this can vary in different individuals. This rate is directly modulated by the autonomic nervous system.

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Does the SA node depolarize?

SA node pacemaker cells depolarize at a rate of 60 to 100 per minute, while the AV node at 40 to 60 per minute. The pacemaker with the highest rate of depolarization takes over as the primary pacemaker.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist
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James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.