Coordination of the Cardiac Cycle

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  • Created by: shyde7
  • Created on: 18-04-16 15:37
Why is heart muscle (or cardiac muscle) unusual?
It can initiate its own contraction.
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What is it called when muscle can initate its own contraction?
Myogenic.
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True or False: "The artial muscle contracts at a higher frequency than the ventricular muscle"?
True.
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What is fibrillation?
A condition where the contractions of the chambers are not synchronised, which causes inefficient pumping,
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Where is the sino-atrial node?
At the top of the right atrium, near where the vena cava empties blood into the atrium.
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What is the sino-atrial node?
A small patch of tissue that generates electrical activity.
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How many times per minute foes the SAN initiate a wave of excitation?
55-80 times per minute.
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What is thr SAN also known as?
The pacemaker.
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Where does the wave of excitation spread first in contracton of the atria?
Over the walls of both atria.
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How does the excitation wave travel over the walls of both atria?
It travels along the membranes of the muscle tissue.
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What happens to the cells as the wave of excitation passes?
The cardiac muscle cells contract.
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What is different about the tissue at the base of the atria?
It is unable to conduct the wave of excitation.
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Where is the atrio-ventricular node?
At the top of the interventricular septum.
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What happens to the wave of excitation when it reaches the atrio-ventricular node?
It is delayed.
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Why is the excitation wave delayed?
To allow time for the atria to finish contracting and for the bloof to flow down into the ventricles.
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Where is the exctitation wave carried after the delay at the AVN?
Down specialised conducting tissue called Purkyne tissue.
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Where are the Punkyne tissue?
This runs down the interventricular septum.
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What happens when the excitation wave reaches the abse of the ventricles?
It spreads uowards from the apec and causes the muscles to contract.
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Why is it important that the wave travels from the base upwards?
This means the base contratcs first, causing the blood to pushed up and out of the heart.
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What is sinus rhythm?
A normal trace (or heart beat) shown on an echocardiogram.
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What is bradycardia?
A slow heart rate.
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What is tachycardia?
A fast heart rate.
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What is atrial fibrilation?
When the atria are beating more frequently than ventricles - there are no clear P waves seen.
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What is an ectopic heartbeat?
Where there is an early ventricular beat.
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What would the patient feel if they had an ectopic heartbeat?
They would feel as if a heartbeat has been missed.
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Other cards in this set

Card 2

Front

What is it called when muscle can initate its own contraction?

Back

Myogenic.

Card 3

Front

True or False: "The artial muscle contracts at a higher frequency than the ventricular muscle"?

Back

Preview of the front of card 3

Card 4

Front

What is fibrillation?

Back

Preview of the front of card 4

Card 5

Front

Where is the sino-atrial node?

Back

Preview of the front of card 5
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