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26 Cards in this Set
- Front
- Back
What is another name for the SA node? |
Pacemaker |
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Where does the impulse start? |
SA node |
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What happens when the SA node pushes blood through the ventricles? |
Atrial Systole |
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Where is the signal passed through after the atrial systole? |
AV node |
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How long does the AV node hold the impulse? |
0.1-0.2 |
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What happens after the AV node holds the impulse? |
Ventricular Systole |
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Where does the electrical impulse pass down through after Ventricular Systole? |
Bundle of His |
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What are the smaller bundles that the impulse passes through? |
Purkinje fibres |
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What is the final result of an impulse? |
Total Diastole |
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What is the Diastole phase? |
Relaxation |
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What is Systole? |
The Contraction phrase |
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What does the sympathetic nervous system? |
Stimulates the heart to beat faster |
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What does the parasympathetic nervous system? |
Returns the heart to its resting level |
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What are the systems coordinated by? |
Cardiac Control Centre |
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Where is the Cardiac Control Centre? |
Medulla Oblongata |
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What do chemoreceptors detect? |
An increase in carbon dioxide and lactic acid |
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An increased concentration of carbon dioxide stimulates which system? |
Sympathetic |
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What do Baroreceptors detect? |
An increase in blood pressure |
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What do Proprioceptors detect? |
An increase in muscle movement |
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Where do the receptors send an impulse to? |
Cardiac Control Centre |
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Where does the cardiac Control Centre send an impulse too? |
To either the sympathetic or parasympathetic nervous system |
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What does the Parasympathetic system do to the heart rate? |
Decreases |
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What happens to the heart rate when the sympathetic nervous system is stimulated? |
Increases |
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What stress hormones are released by the adrenal glands? |
Adrenaline and Noradrenalin |
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A stress induced adrenaline response results in? |
An increase in blood pressure |
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What is intrinsic control? |
When temperature increases and blood become more viscous |