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sinoatrial node
 

Definitions from WordNet

Noun sinoatrial node has 1 sense
  1. pacemaker, cardiac pacemaker, sinoatrial node, SA node - a specialized bit of heart tissue that controls the heartbeat
    --1 is a kind of cardiac muscle, heart muscle

Definitions from the Web

Sinoatrial Node

Description:

The sinoatrial node is an electrical structure located in the right atrium of the heart. Also known as the natural pacemaker, it initiates the heartbeat by generating electrical impulses.

Sample Sentences:

  1. The sinoatrial node plays a vital role in regulating the heart's rhythm.
  2. Damage to the sinoatrial node may lead to irregular heartbeats.
  3. The electrical activity of the sinoatrial node sets the pace for the entire heart.

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