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Chapter 20

MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.
1)  The influence of blood vessel diameter on peripheral resistance is: 
A) the only factor that influences resistance. 
B) significant because resistance is inversely proportional to the fourth power of the vessel radius. 
C) significant because resistance is directly proportional to the blood vessel diameter. 
D) insignificant because vessel diameter does not vary. 


2)  Peripheral resistance: 
A) decreases with increasing length of the blood vessel. 
B) increases as blood vessel diameter increases. 
C) increases as blood viscosity increases. 
D) is not a major factor in blood pressure in healthy individuals. 


3)  The velocity of blood flow: 
A) is in direct proportion to the total cross-sectional area of the blood vessels. 
B) is slower in the arteries than capillaries since they possess a relatively large diameter. 
C) is slower in the veins than in the capillaries since veins have a large diameter. 
D) is slowest in the capillaries since the total cross-sectional area is the greatest. 


4)  The pulse pressure is: 
A) systolic pressure plus diastolic pressure. 
B) systolic pressure minus diastolic pressure. 
C) systolic pressure divided by diastolic pressure. 
D) diastolic pressure plus 1/3 (systolic pressure plus diastolic pressure). 


5)  Aldosterone will: 
A) promote an increase in blood pressure. 
B) promote a decrease in blood volume. 
C) result in a larger output of urine. 
D) decrease sodium reabsorption.