cardiac pacemaker
Definition
Noun: 1. A specialized cluster of cells in the heart that generates and regulates the electrical impulses controlling the heartbeat. This is the primary natural pacemaker of the heart, typically referring to the sinoatrial (SA) node.
Usage
The term "cardiac pacemaker" is used in medical and biological contexts to describe the heart's intrinsic system for initiating and maintaining a regular rhythm. * As a subject: "The cardiac pacemaker initiates each heartbeat." * As an object: "The electrical signal originates from the cardiac pacemaker."
Examples
- The sinoatrial node, the heart's primary cardiac pacemaker, is located in the right atrium.
- Damage to the cardiac pacemaker can lead to an irregular heartbeat, known as arrhythmia.
- In a healthy heart, the cardiac pacemaker sets the rhythm for cardiac muscle contraction.
Advanced Usage
- "Ectopic pacemaker": Refers to other heart tissue that can generate impulses if the primary cardiac pacemaker fails, often resulting in an abnormal rhythm.
- "Artificial pacemaker": A medical device implanted to perform the function of the natural cardiac pacemaker when it is diseased or damaged.
Variants and Related Words
- Pacemaker (noun): A common shorter form for "cardiac pacemaker." It can also refer to the artificial medical device.
- Sinoatrial node (noun): The specific anatomical name for the primary cardiac pacemaker.
- SA node (noun): The common abbreviation for the sinoatrial node.
Synonyms
- Sinoatrial node (specific anatomical term)
- SA node (abbreviation)
- Natural pacemaker (contrasts with an artificial device)
Related Phrases
- Pacemaker cells: The specialized cells that make up the cardiac pacemaker tissue.
- Pacemaker potential: The spontaneous electrical activity generated by the cardiac pacemaker cells.
Noun
-
a specialized bit of heart tissue that controls the heartbeat
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