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Questions and Answers
What is the main factor that determines cardiac output under normal unstressed conditions?
What is the main factor that determines cardiac output under normal unstressed conditions?
- Peripheral factors that determine venous return (correct)
- The vasomotor center of the brain
- The sympathetic nervous system
- The heart's pumping ability
What is the relationship between cardiac output and total peripheral resistance when arterial pressure is unchanged?
What is the relationship between cardiac output and total peripheral resistance when arterial pressure is unchanged?
- Cardiac output increases as total peripheral resistance increases
- Cardiac output decreases as total peripheral resistance increases (correct)
- Cardiac output is directly proportional to total peripheral resistance
- There is no relationship between cardiac output and total peripheral resistance
What is the primary mechanism that regulates local blood flow in most tissues?
What is the primary mechanism that regulates local blood flow in most tissues?
- The vasomotor center of the brain
- Tissue metabolism (correct)
- The Bainbridge reflex
- The sympathetic nervous system
What is the consequence of the returning blood exceeding the heart's pumping ability?
What is the consequence of the returning blood exceeding the heart's pumping ability?
What is the sum of all the local blood flow regulations in the peripheral circulation?
What is the sum of all the local blood flow regulations in the peripheral circulation?
What is the reflex initiated by the stretched right atrium that increases the heart rate?
What is the reflex initiated by the stretched right atrium that increases the heart rate?
What is the primary controller of cardiac output in normal conditions?
What is the primary controller of cardiac output in normal conditions?
What happens to the cardiac muscle when the heart chambers are stretched due to increased blood flow?
What happens to the cardiac muscle when the heart chambers are stretched due to increased blood flow?
What is the direct effect of stretching the sinus node in the right atrium?
What is the direct effect of stretching the sinus node in the right atrium?
What is the result of the Frank-Starling mechanism when increased quantities of blood flow into the heart?
What is the result of the Frank-Starling mechanism when increased quantities of blood flow into the heart?
What determines the amount of blood pumped by the heart?
What determines the amount of blood pumped by the heart?
What is the name of the mechanism that allows the heart to pump automatically the amount of blood that flows into it?
What is the name of the mechanism that allows the heart to pump automatically the amount of blood that flows into it?
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