Cardiac output, stroke volume, heart rate
- Created by: z_mills1
- Created on: 05-06-14 19:47
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- Cardiac output, stroke volume, heart rate
- Heart rate (HR)
- the number of times the heart ventricles beat in one minute
- average = 70-72 bpm
- maximum = 220-age
- low resting heart rate indicates high levels of fitness
- bradycardia - resting HR below 60bpm
- Stroke volume
- the volume of blood ejected each time a ventricle contracts
- the difference in the volume of blood in the ventricle before and after contraction
- Cardiac output
- the volume of blood ejected by the heart ventricles in one minute
- generally measured from left ventricle (avg. 5 litres per minute)
- cardiac output = stroke volume x resting HR
- Starling's law of the heart
- the greater the venous return, the greater the strength of contraction
- effects of exercise on the heart?
- HR increases
- stroke volume increases
- cardiac output increases - because of starling's law
- because cardiac output = SV x HR
- Heart rate (HR)
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