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Veins contain valves to prevent blood fr...View Answer
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A) cardiogenic,which results from any defect in blood vessels
B) hypovolemic,caused by increased blood volume
C) circulatory,where blood volume is normal and constant
D) vascular,due to extreme vasodilation as a result of loss of vasomotor tone
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A) is abolished when abnormally high CO2 levels persist
B) is less sensitive to pH than to a decreased oxygen level
C) is controlled by cardiac centers in the pons
D) causes constriction of cerebral blood vessels in response to a drop in systemic blood pressure
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A) significant because resistance is directly proportional to the blood vessel diameter
B) insignificant because vessel diameter does not vary
C) the only factor that influences resistance
D) significant because resistance is inversely proportional to the fourth power of the vessel radius
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brachiocep...View Answer
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A) 170/96 in a 50- year- old man
B) 120/80 in a 30- year- old man
C) 140/90 in a 70- year- old woman
D) 110/60 in a 20- year- old woman
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A) It is measured in mm Hg.
B) It is greatest where resistance is highest.
C) It is relatively constant through all body organs.
D) Blood flow through the entire vascular system is equivalent to cardiac output.
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internal c...View Answer
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At rest,the abdominal organs receive app...View Answer
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A) increases as blood vessel diameter increases
B) increases as blood viscosity increases
C) is not a major factor in blood pressure in healthy individuals
D) decreases with increasing length of the blood vessel
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A) venules
B) elastic arteries
C) arterioles
D) muscular arteries
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A) kidney
B) liver
C) lungs
D) heart
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A) a local increase in histamine
B) an increase in local tissue carbon dioxide
C) a local increase in pH
D) a decrease in local tissue oxygen content
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A) slowest in the capillaries because the total cross- sectional area is the greatest
B) slower in the arteries than in capillaries because arteries possess a relatively large diameter
C) slower in the veins than in the capillaries because veins have a large diameter
D) in direct proportion to the total cross- sectional area of the blood vessels
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A) Excess red cell production would cause a blood pressure increase.
B) An increase in cardiac output corresponds to a decrease in blood pressure,due to the increased delivery.
C) Systemic vasodilation would increase blood pressure,due to diversion of blood to essential areas.
D) Excess protein production would decrease blood pressure.
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A) Veins have a small lumen in relation to the thickness of the vessel wall.
B) Veins are called capacitance vessels or blood reservoirs.
C) Up to 35% of total body blood is in venous circulation at any given time.
D) Venous valves are formed from the tunica media.
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A) tunica externa
B) tunica intima
C) tunica adventitia
D) tunica media
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The two 2- mm vessels would deliver cons...View Answer
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