PE NIPPS cardiac function

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what does SYSTOLE & DIASTOLE mean?
systole=CONTRACTION diastole=RELAXING
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what blood vessels lead blood out of the heart?
pulmonary artery (to lungs) ; aorta (to body)
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what blood vessel carries oxygenated blood into the heart?
pulmonary vein (superior & inferior vena cava = unoxygenated)
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what happens to HR as exercise intensity increases
bpm increases
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cardiac output (Q) = ???
HR x SV (Q=amount of blood pumped from left ventricle per min)
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effects of training on an athletes heart?
hypertrophy (muscle growth) of heart; braydycardia (HR
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explain briefly 'anticipatory rise'
heart rate starts to to increase before exertion(increased adrenaline)
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what does 'ejection fraction' represent?
% of blood entering the left ventricle of which is pumped out per beat
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how can training increase the ejection of the heart?
(norm=60%) cardiac fibres stretch;increases strength of contraction
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describe 'starlings law' (1)
SV increases as diastolic filling of ventricles increase
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describe 'starlings law' (2)
ventricles stretch more so become more forceful
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three parts of venus return?
pocket valves, muscle pump, respiratory pump
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briefly explain cardiovascular drift
hot/endurance; HR increases; blood to skin to cool(sweat); blood volume decreases; less blood to heart; =Q&HR increase (as SV decreases)
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what is the main regulator of the heart?
cardiac control centre
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sympathetic nervous system; increase or decrease HR?
increase HR
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parasympathetic nervous system; increase or decrease HR?
decrease HR
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what detects a rise of CO2?
chemoreceptors, inform CCC
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what does a release in adrenaline cause?
stronger contractions of the heart increasing SV
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what does noradrenaline cause?
increase HR
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what do (i) proprioceptors (ii) baroreceptors detect?
(i)in muscles detect increase in activity (ii)in heart detect increase in blood pressure
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intrinsic control during exercise?
increase temp=faster nerve impulses; increase venous return so increase SV (starlings law)
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hormonal control during exercise?
adrenaline & noradrenaline stimulate SA node & increase speed&force of contractions
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where is the CCC situated?
in the medulla oblongata in the brain
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whats the order of triggers in regulating HR?
C C C S S A B P S
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what happens when SA node is stimulated?
atria contract forcing blood into ventricles
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SA node causes the AV node to be triggered;what happens next?
sends impulses down to bundle of his & purkinje fibres
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what do the bundle of his and purkinje fibres do?
force ventricles to contract pushing blood out the heart
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Other cards in this set

Card 2

Front

what blood vessels lead blood out of the heart?

Back

pulmonary artery (to lungs) ; aorta (to body)

Card 3

Front

what blood vessel carries oxygenated blood into the heart?

Back

Preview of the front of card 3

Card 4

Front

what happens to HR as exercise intensity increases

Back

Preview of the front of card 4

Card 5

Front

cardiac output (Q) = ???

Back

Preview of the front of card 5
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