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Mechanism of Heart Beat
Mechanism of Heartbeat
10.3
Mechanism of Heartbeat
Heartbeat:
Source: [Text book Biology Form 4]
Average heartbeat = 72 times/minute.
Sinoatrial nodes (SA) and atrioventricular nodes (AV) functions to ensure the heartbeat beats at a proper rate.
Sinoatrial nodes are also known as the pacemaker of the heartbeat.
Pacemaker sets and coordinates the contraction of the heart but it is also influenced by:
Nervous system.
Endocrine system.
Sympathetic and parasympathetic nerves.
Adrenaline (hormone).
The sequence of the contraction of the heart muscles that pump the blood:
SA nodes produce electrical impulses.
Electrical impulses spread rapidly to both atria, causing the atria to contract simultaneously.
The contraction of the atria causing the blood pressure in the atria to increase and pump the blood to the ventricle.
Electrical impulses arrived at the AV nodes.
The electrical impulses spread through the bundle of His, and Purkinje fibers until it reaches the heart's apex.
The electrical impulses spread to both ventricles and causing them to contract simultaneously.
This causing the blood pressure in both ventricles to increase and pump the blood to the lungs and to all body parts.
Chapter : Transportation in Humans and Animals
Topic : Mechanism of Heart Beat
Form 4
Biology
View all notes for Biology Form 4
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