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Control of Cardiac Output


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In English
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[Front]


If TPR falls and cardiac output does not change, what happens to arterial and venous pressure
[Back]


Arterial pressure will fall Venous pressure will rise

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10 questions
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If cardiac output is increased, while TPR stays the same, what happens to arterial and venous pressure
Arterial pressure will rise Venous pressure will fall --> this is due to blood being pumped rapidly out of the veins so there is reduction in pressure
What is demand led pumping
If the body needs more blood, then the heart needs to pump more to meet the ‘demand’ This demand is expressed as changes in arterial and venous pressure
What is the relationship between ventricular filling and venous pressure
The higher the venous pressure the more the heart fills in diastole This is known as ventricular compliance curve
What is the Starlings Law for the heart
The more the heart fills the harder it contracts (up to a limit) The harder it contracts the bigger the stroke volume Rises in venous pressure automatically lead to rises in stroke volume
What determines the force of contraction
End diastolic volume Contractility Contractility Increased by sympathetic activity
Relationship between arterial and venous pressure with stroke volume
If venous pressure rises → stroke volume will rise If arterial pressure falls → stroke volume will rise
In the Autonomic nervous system, which part increases heart rate
Reducing parasympathetic activity Increasing sympathetic activity