Coordination of the cardiac cycle

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20 Terms

1
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What system controls the heart rate ?

Autonomic nervous system

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What does the autonomic nervous system do ?

self governing , control involuntary ( subconscious) activities of internal muscles and glands

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Cardiac muscle

Myogenic : self contracting , generates its won electrical impulses

Contraction is caused by electrical impulses, traveling across the muscle

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Atrial muscle contacts at a higher or lower frequency then ventricular muscle ?

Slightly higher ( more often )

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What is fibrillation ?

Due to the muscle is myogenic, if it is to carefully coordinated it could lead to fibrillation

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What are the cells that generates electrical impulses ?

Dino atrial node ( SAN ) - pacemaker cells

Generates electrical impulses, controls frequency of heartbeat

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What is the other phase for electrical impulse ?

Wave of excitation

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How does the electrical impulse travel through the heart ?

1) SAN sends impulse over atrial muscle as ‘ wave of excitation ‘

2) Atrioventricular septum is non - conductive , it prevents the impulse from traveling down over the ventricle walls.

3) The impulse pauses at the AVN, allowing time for the atria to fully contract and empty the blood into the ventricles , before the ventricles contracts.

4) Impulse travel down bundle of his the though purkinje fibers over ventricle muscle

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What is a ECG ?

Electrocardiogram

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What are the uses of ECG ?

Shows the electrical activity of the heart during one cardiac cycle

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Draw a graph of one heartbeat ?

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What does P mean ?

Excitation of atria

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What does QRS mean ?

Excitation of ventricle

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What does T mean ?

Diastole

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<p>What does this trace show ? </p>

What does this trace show ?

Normal trace , sinus rhythm

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<p>What does this trace show ? </p>

What does this trace show ?

Bradycardia, slow heart rate

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What does this trace show ?

fast Heart rate , Tachycardia

<p>fast Heart rate , Tachycardia </p>
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<p>What does this trace show ? </p>

What does this trace show ?

Atrial Fibrillation

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<p>What does this trace show ? </p>

What does this trace show ?

Ectopic heartbeat , single heartbeat is out of rhythm