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AS Cardiac Output

QuestionAnswer
What is the definition of Stroke volume? The volume of blood leaving the heart (left ventricle) per beat
What is ejection fraction? Proportion of blood in left ventricle pumped out each beat
Name three venous return mechanisms? Pocket valves / respiratory pump / skeletal pump / suction action of the heart
What is starlings law The greater the venous return (the greater the stretch of the heart) the greater the strength of contraction
The relationship between Cardiac out put and stroke volume? CO = SV X HR, if SV increases so doe cardiac output
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.
What is the definition of cardiac out put? Volume of blood leaving the heart per minute
What is venous return? The amount of blood returning to the heart
What is heart rate? The number of times the heart contracts and relaxes (cardiac cycles) per minute
The variables that make up stroke volume? Venous return / contractility of heart muscle / elasticity of heart muscles (starlings law)
What does bradycardia mean? The reduction in resting heart rate that accompanies training.
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.
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
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
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
Created by: Tina Dean
 

 



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