18 Questions
Which of the following statements about fluid flow in vessels is correct?
Turbulence in flow increases the resistance to fluid flow.
What is the primary mechanism by which the body regulates blood flow to individual organs?
Varying vessel diameters
If the radius of a blood vessel is reduced by 5%, what is the approximate reduction in flow rate?
19%
What is the consequence of increased turbulence in blood flow caused by plaque buildup in arteries?
Decreased blood pressure downstream
Which part of the circulatory system creates the pressure difference that drives blood flow?
The heart's two pumps
What is the primary function of the capillary network in the circulatory system?
To allow exchange of substances with individual cells
What is responsible for reducing the pressure created by the heart's ventricles as blood flows through the blood vessels?
Resistance of blood vessels
Which ventricle increases arterial blood pressure to drive blood flow throughout the body except the lungs?
Left ventricle
Where does the right ventricle pump blood for gas exchange with atmospheric gases?
Lungs
Which type of vessels have the smallest diameter in the circulatory system?
Capillaries
What allows the circulatory system to regulate flow to various organs?
Dilation and constriction of arteries and capillaries
What makes the circulatory system flexible in regulating flow rates?
Tube radius sensitivity
According to Poiseuille's law, what is the effect of reducing the radius of a blood vessel by half on the flow rate, assuming all other factors remain constant?
The flow rate is reduced by a factor of 16
Which of the following statements about blood vessels is true?
Blood vessels are elastic and can adjust their size
What is the primary mechanism by which the body regulates blood flow during exercise?
Dilating blood vessels to important muscles and organs
If turbulence occurs in a blood vessel, how does it affect the application of Poiseuille's law?
Poiseuille's law is no longer valid, and the flow rate is decreased
What is the primary factor that determines the resistance to blood flow in a vessel, according to Poiseuille's law?
The radius of the vessel
What is the effect of plaque buildup in arteries on blood flow, according to the information provided?
Plaque buildup decreases blood flow by decreasing the vessel radius
Test your knowledge about the pressure created by the heart's ventricles as blood flows through the blood vessels, and how the left and right ventricles function in driving blood flow through the body and lungs for gas exchange.
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