Control of Cardiac Output
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10 questions
| 🇬🇧 | 🇬🇧 |
| If TPR falls and cardiac output does not change, what happens to arterial and venous pressure | Arterial pressure will fall Venous pressure will rise |
| 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 ultrasound of the heart | Echocardiogram |
| 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 |
| In a stroke volume and venous pressure graph, what does the slope represent | Contractility of the ventricle |
| 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 |