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Questions and Answers
Which of the following is the most important factor that determines the blood flow in a vessel?
Which of the following is the most important factor that determines the blood flow in a vessel?
- The viscosity of the blood
- The cardiac output of the left ventricle
- The pressure gradient between the beginning and end of the vessel (correct)
- The length of the vessel
Which of the following is the primary mechanism of metabolic autoregulation of blood flow?
Which of the following is the primary mechanism of metabolic autoregulation of blood flow?
- Increased blood viscosity
- Autoregulation of the arteriolar diameter (correct)
- Increased cardiac output
- Vasodilation of the venules
How does an increase in hematocrit affect blood viscosity and blood flow?
How does an increase in hematocrit affect blood viscosity and blood flow?
- Decreases viscosity, increases flow
- Has no effect on viscosity or flow
- Increases viscosity, increases flow
- Increases viscosity, decreases flow (correct)
Which of the following vasoactive substances is most likely to cause vasodilation of the arterioles?
Which of the following vasoactive substances is most likely to cause vasodilation of the arterioles?
What is the relationship between the radius of a vessel and its resistance to blood flow?
What is the relationship between the radius of a vessel and its resistance to blood flow?
Which of the following is the most important mechanism by which the body can autoregulate blood flow to meet the metabolic needs of a tissue?
Which of the following is the most important mechanism by which the body can autoregulate blood flow to meet the metabolic needs of a tissue?
What is the main site of peripheral resistance in the circulatory system?
What is the main site of peripheral resistance in the circulatory system?
How does increased diameter of blood vessels affect resistance in the circulatory system?
How does increased diameter of blood vessels affect resistance in the circulatory system?
What type of blood flow helps eliminate energy losses in the circulatory system?
What type of blood flow helps eliminate energy losses in the circulatory system?
In cases of mild narrowing due to atherosclerosis, what happens to blood flow?
In cases of mild narrowing due to atherosclerosis, what happens to blood flow?
How do small changes in arteriolar diameter affect blood flow in the body?
How do small changes in arteriolar diameter affect blood flow in the body?
Which factor has a less significant effect on blood viscosity compared to hematocrit?
Which factor has a less significant effect on blood viscosity compared to hematocrit?
Which of the following is the most important trigger for the continuous generation of a vasodilator substance?
Which of the following is the most important trigger for the continuous generation of a vasodilator substance?
Which of the following is the main site of action for the vasodilator substance generated in response to increased shear stress?
Which of the following is the main site of action for the vasodilator substance generated in response to increased shear stress?
How do vasodilator drugs (e.g., Nitrovasodilators) affect the heart?
How do vasodilator drugs (e.g., Nitrovasodilators) affect the heart?
Which of the following vasoactive substances is the most potent vasoconstrictor?
Which of the following vasoactive substances is the most potent vasoconstrictor?
What is the balance between Thromboxane A2 and Prostacyclin (PGI2) important for?
What is the balance between Thromboxane A2 and Prostacyclin (PGI2) important for?
How does autoregulation of blood flow to some tissues work?
How does autoregulation of blood flow to some tissues work?
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