It is found within the right atrium and it causes the initial stimulus for contraction
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Where is the AVN found and what does it do?
It lies within the atria and after a short delay, it sends he impulse to the Bundle of His
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What does the Bundle of His do?
Conducts wave to the base of the ventricles and causes them to contract
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Smoking is a risk factor, what does it cause?
The carbon monoxide wrecks haemoglobin and nicotine increases blood pressure
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High salt intake is a risk factor, what does it cause?
It increases blood pressure
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High saturated fat intake is a risk factor, what does it cause?
Increases the amount of LDLs in the blood
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High Blood Pressure is a risk factor, what does it cause?
It makes the heart work harder and causes arteries to burst
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What is an atheroma?
Fatty build up within the artery walls
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What does an atheroma lead to?
Thrombosis
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What is thrombosis?
If atheroma breaks epithelium of blood vessel, the rough surfaces stops blood flow, which leads to a blood clot (thrombus). A thrombus may block a blood vessel, so no oxygen goes to the tissue
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What is an Aneurysm?
When an artery swells and fills with blood. If they frequency burst, it can lead to a haemorrhage
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What is the cardiac cycle?
The volume of blood pumped by the heart per minute
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