Unit 1 - HEARTS

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What is meant by a risk factor?
Something that increases the probability of suffering from a disease
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What are the risk factors of CHD?
Age and sex, genetic factors, smoking, high blood pressure, high concentration of LDLs
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Where are the atrioventricular valves found?
Between the atria and ventricles
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What is meant by atrial systole?
Contraction on the atria
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Give 2 ways in which the cardiac output is increased after vigorous exercise?
Increased heart rate; Increased stroke vol;
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Explain the advantage of the increase in the rate of blood flow to heart muscle during exercise?
More blood pumped out each beat / increase in stroke volume
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Explain the link between atheroma and the increased risk of aneurism?
Fatty material within walls of arteries; Vessels narrow; Blood pressure rises; Weakened blood vessels may burst;
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Explain what causes the blood pressure in the aorta to be higher than in the pulmonary artery?
Left ventricle has thicker / more muscle;
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Explain the meaning of the term atheroma
Fatty substances/foam cells in artery wall/under endothelium;
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Explain why atheroma may lead to a blood clot.
Narrows artery; Damage to endothelium;
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Suggest two ways in which prolonged high blood pressure may affect the arteries.
Muscle in artery walls becomes thicker; Aneurysm / ballooning of artery walls may occur; Damage to endothelium (so foam cells enter);
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The sinoatrial node (SAN) is in the right atrium of the heart. Describe the role of the sinoatrial node.
Sends out electrical activity/ impulses; Initiates the heartbeat / acts as a pacemaker / (stimulates) contraction of atria;
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Other cards in this set

Card 2

Front

What are the risk factors of CHD?

Back

Age and sex, genetic factors, smoking, high blood pressure, high concentration of LDLs

Card 3

Front

Where are the atrioventricular valves found?

Back

Preview of the front of card 3

Card 4

Front

What is meant by atrial systole?

Back

Preview of the front of card 4

Card 5

Front

Give 2 ways in which the cardiac output is increased after vigorous exercise?

Back

Preview of the front of card 5
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