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Week 11 HEART Worksheet

Week 11 HEART Worksheet - • Stroke volume is affected by...

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Cardiac Output Amount of blood pumped per minute Normal is around 5L/minute or 5000 ml/min What Affects Heart Rate? 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 Factors Affecting Cardiac Output Cardiac output will be changed by adjusting heart rate or stroke volume Heart rate affected by autonomic nervous system and hormones
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Unformatted text preview: • 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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