Week 11 HEART

Week 11 HEART - and hormones Stroke volume is affected by...

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Cardiac Output
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Amount of blood pumped per minute Normal is around 5L/minute or 5000 ml/min
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What Affects Heart Rate?
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Autonomic nervous system - Sympathetic increases heart rate (+) chronotropic effect - Parasympathetic decreases heart rate – (- ) chronotropic effect Adrenal medulla secretes epinephrine and norepinephrine which increases heart rate
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Factors Affecting Cardiac Output
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Cardiac output will be changed by adjusting heart rate or stroke volume Heart rate affected by autonomic nervous system
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Unformatted text preview: and hormones Stroke volume is affected by changing EDV, ESV or both Factors Affecting Stroke Volume Peripheral resistance- if peripheral resistance is increased, less blood is pumped out so larger ESV and smaller stroke volume Contractility of the heart- Less contractility, less blood pumped out, so larger ESV and smaller stroke volume Venous return- Increased venous return leads to an increased EDV and increased stroke volume...
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Week 11 HEART - and hormones Stroke volume is affected by...

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