Pe applied exercise physiology - chapter 5

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  • Created by: Hannah
  • Created on: 17-05-13 14:55
blood circulates from the heart to the lungs and returns to the heart
Pulmonary circulation
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blood circulates from the heart to the body tissue and returns to the heart
Systematic circulation
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Explain what the SAN or sino-atrial node is
small mass of cardiac muscle, found in the wall of the right atrium that generates a heartbeat (known as the pacemaker)
3 of 21
Impulses generated without nervous stimulation
Myogenic
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the heart is said to be _________ because it comes from within the heart itself
Intrinsic
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the bundle of tissue found in atrio-ventricular septum that forms part of the hearts conduction system
Atrio-ventricular node
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the specialised bundles of nerve tissue, found in the inter ventricular septum that forms part of the conduction system
Bundle of his
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specialised nerve fibres found in the ventricles
purkinje fibres
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the atrio-ventricular node conducts the impulse from the atria to the
ventricles
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the purkinjee fibres carry the impulse to the ventricular wall to cause
contractions
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what are the four chambers within the heart
left atria, right atria, left ventricle, right ventricle
11 of 21
the volume of blood leaving the left ventricle per beat
stroke volume
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proportion of blood in left ventricle pumped out each beat
ejection fraction
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volume of blood leaving the left ventricle per minute or stroke volume x heart rate
cardiac output
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what is starlings law of the heart?
the greater the venous return, the greater the strength of contraction
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the mechanisms that return blood back to the heart
venous return
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what are chemoreceptors?
group of cells sensitive to changes in blood acidity
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where are chemoreceptors located?
in the medulla omblongata
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what is hypertrophy?
the increase in size of the heart that accompanies training
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what is bradycardia?
the reduction in resting heart rate that accompanies training
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an increase in heart rate that occurs during prolonged exercise that compensates for a decrease in stroke volume in an attempt to maintain cardiac output
cardiovascular drift (due to a loss of fluid in the body e.g. sweat)
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Other cards in this set

Card 2

Front

blood circulates from the heart to the body tissue and returns to the heart

Back

Systematic circulation

Card 3

Front

Explain what the SAN or sino-atrial node is

Back

Preview of the front of card 3

Card 4

Front

Impulses generated without nervous stimulation

Back

Preview of the front of card 4

Card 5

Front

the heart is said to be _________ because it comes from within the heart itself

Back

Preview of the front of card 5
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