7.3 Peak preformance

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What is aerobic capacity
The ability to take in, transport and use oxygen.
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What is VO2
our intake of oxygen per minute, VO2 max is what it is during exercise.
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What will the body change uncontiously during exercise
ventilation and cardio-vascular system.
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formula for cardiac output
stroke volume x heart rate
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what is stroke volume measured in?
cm3
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What is venous return
The amount of blood returning to the heart after a contraction.
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What happens to cardiac output during exercise and why?
it increases because more blood is taken in during exercise and therefore the recoil is greater
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At rest what % does the heart empty to?
40%
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Give 2 reasons that heart rate can vary
1. heart size, 2.endurance training
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the heart will contract without any nervous stimulation, what do you call this?
myogenic
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Describe how the charge is caried through the heart
small changes cause the cells to become polarised which effects the cells surrounding and spreads like a wave.
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Where does depolarisation start?
the sinoatrial node
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What physical path does the impulse take round the heart?
1. across the atria walls, 2.to the ventricles via the AVN, 3. down to the apex of the heart 4. up the sides causing ventricle contraction
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there is a 0.13s delay between the atria and ventricle contacting why?
to allow the ventricles to fill with blood
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what is it that we here when we listen to the heart beat?
the valves closing
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what is the bundle of his and what is it made of?
a group of fibres called the purkyne fibres
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how can the electrical activity be displayed?
an electrocardiogram (ECG)
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How is an ECG carried out?
Electrodes are stuck on the person, the electrodes can detects when there is a change in polerisation.
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What 4 parts does the ECG contain
P wave, PR interval, QRS complex, T wave.
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Card 2

Front

What is VO2

Back

our intake of oxygen per minute, VO2 max is what it is during exercise.

Card 3

Front

What will the body change uncontiously during exercise

Back

Preview of the front of card 3

Card 4

Front

formula for cardiac output

Back

Preview of the front of card 4

Card 5

Front

what is stroke volume measured in?

Back

Preview of the front of card 5
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