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Cardiac System - Coggle Diagram
Cardiac System
key cardiac terms
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ejection fraction
the proportion/fraction of blood that leaves the ventricle compared to what was in it per contraction
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starlings law
when venous return increases, stroke volume also increases
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cardio-vascular drift
- sweating occurs due to sub-max exercise in hot conditions
- increased viscosity of blood
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- to maintain cardiac output heart rate increases
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lifestyle effects
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coronary heart disease
diseases that affect the ability of the coronary blood vessels to supply oxygenated blood to the heart
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atherosclerosis
build of plaque (fatty deposits) in arteries causing blockages, 'Atheroma'
causes:
heart attack
coronary vessel gets blocked, lack of oxygen to heart so cant beat normally
stroke
blockage of blood vessel to brain, starves brain of oxygen
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high blood pressure
increase pressure on vessel wall, putting strain on arteries, heart works harder to force blood through
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control of heart rate
- impulse sent to cardiac control centre (CCC)
- sympathetic nervous system
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- receptors (chemoreceptors, baroreceptors, proprioceptors)
- parasympathetic nervous system
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