AS Cardiac Output
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each of the black spaces below before clicking
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| What is the definition of Stroke volume? | The volume of blood leaving the heart (left ventricle) per beat
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| What is ejection fraction? | Proportion of blood in left ventricle pumped out each beat
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| Name three venous return mechanisms? | Pocket valves / respiratory pump / skeletal pump / suction action of the heart
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| What is starlings law | The greater the venous return (the greater the stretch of the heart) the greater the strength of contraction
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| The relationship between Cardiac out put and stroke volume? | CO = SV X HR, if SV increases so doe cardiac output
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| What is the term athlete’s heart mean? The increase in size of the heart that accompanies training. | The increase in size of the heart that accompanies training.
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| What is the definition of cardiac out put? | Volume of blood leaving the heart per minute
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| What is venous return? | The amount of blood returning to the heart
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| What is heart rate? | The number of times the heart contracts and relaxes (cardiac cycles) per minute
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| The variables that make up stroke volume? | Venous return / contractility of heart muscle / elasticity of heart muscles (starlings law)
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| What does bradycardia mean? | The reduction in resting heart rate that accompanies training.
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| What is the cardiovascular drift? | An increase in heart rate that occurs during prolonged steady exercise that compensates for a decrease in stroke volume in an attempt to maintain cardiac output.
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| How does stroke volume increase during exercise? | More venous return, greater the filling of the ventricles , heart muscle stretches, greater strength of contraction (starlings law), greater ejection fraction
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| What are the effects of exercise on heart rate? | Heart rate increases, stroke volume increases (starlings law), cardiac output increases because CO= SV X HR
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| What happens to cardiac output at rest? | It remains the same, but stroke volume is higher and resting heart rate is lower. Effect of training
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Created by:
Tina Dean
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