Podcast
Questions and Answers
What is the role of arterioles in the circulation?
What is the role of arterioles in the circulation?
- Serve as exchange sites
- Hold more than half of the blood in the circulatory system
- Direct blood to individual tissues by selectively constricting and dilating (correct)
- Act as pressure reservoirs
Which vessel type serves as blood reservoirs in the circulatory system?
Which vessel type serves as blood reservoirs in the circulatory system?
- Venules
- Capillaries
- Arteries
- Veins (correct)
What is the main function of elastic arteries?
What is the main function of elastic arteries?
- Act as pressure reservoirs (correct)
- Direct blood to individual tissues by selectively constricting and dilating
- Hold more than half of the blood in the circulatory system
- Serve as exchange sites
Which factor is responsible for vasoconstriction and vasodilation?
Which factor is responsible for vasoconstriction and vasodilation?
What is the relationship between pressure and peripheral resistance in the circulation?
What is the relationship between pressure and peripheral resistance in the circulation?
What is the main function of capillaries in the circulatory system?
What is the main function of capillaries in the circulatory system?
What determines blood flow according to Ohm's law?
What determines blood flow according to Ohm's law?
What triggers the release of nitric oxide (NO) in the endothelial cells of blood vessels?
What triggers the release of nitric oxide (NO) in the endothelial cells of blood vessels?
What causes myogenic contraction in the smooth muscle of blood vessel walls?
What causes myogenic contraction in the smooth muscle of blood vessel walls?
What is responsible for the long-term control of blood flow in tissues over a period of days, weeks, or even months?
What is responsible for the long-term control of blood flow in tissues over a period of days, weeks, or even months?
In acute control of local blood flow, what leads to rapid changes in local vasodilation or vasoconstriction of arterioles and precapillary sphincters?
In acute control of local blood flow, what leads to rapid changes in local vasodilation or vasoconstriction of arterioles and precapillary sphincters?
What is the primary function of vasomotion in blood vessels?
What is the primary function of vasomotion in blood vessels?
What greatly influences blood flow and blood pressure?
What greatly influences blood flow and blood pressure?
What pressure is under tonic sympathetic control?
What pressure is under tonic sympathetic control?
What happens when factors cause arteriole vasoconstriction?
What happens when factors cause arteriole vasoconstriction?
What does increased sympathetic activity lead to in veins?
What does increased sympathetic activity lead to in veins?
At what value does cardiac output no longer keep up, according to the text?
At what value does cardiac output no longer keep up, according to the text?
What does the vascular function curve represent?
What does the vascular function curve represent?
What determines the right atrial pressure, end-diastolic volume, and end-diastolic fiber length?
What determines the right atrial pressure, end-diastolic volume, and end-diastolic fiber length?
What point is the unique operating or equilibrium point of the system in the steady state?
What point is the unique operating or equilibrium point of the system in the steady state?
What is the relationship between right atrial pressure, venous return, end-diastolic volume, and end-diastolic fiber length?
What is the relationship between right atrial pressure, venous return, end-diastolic volume, and end-diastolic fiber length?
What is the value for the right atrial pressure at which venous return is zero and right atrial pressure is at its highest value?
What is the value for the right atrial pressure at which venous return is zero and right atrial pressure is at its highest value?
What occurs when the two curves intersect in the cardiac and vascular function curves?
What occurs when the two curves intersect in the cardiac and vascular function curves?
What does increased sympathetic activity lead to in veins?
What does increased sympathetic activity lead to in veins?
What determines peripheral resistance and how does it affect blood pressure?
What determines peripheral resistance and how does it affect blood pressure?
