Pressure Applied to the Cardiovascular System

Pressure Applied to the Cardiovascular System
Pressure Applied to the Cardiovascular System
1. When a person is standing upright, what can be said about the arterial blood
pressure in their feet?
A. It will be greater than arterial pressure in the aorta.
B. It will be less than the arterial pressure in the aorta.
C. It will be the same as the arterial pressure in the aorta.
D. It will be the same as the venous blood pressure in the feet.
2. A plaque in a coronary vessel wall will result in a decrease in the lumen diameter
of a coronary artery and in less oxygen being delivered to the heart muscle. Why
is this?
A. A protruding plaque increases the distance blood needs to travel, and this
increases resistance to flow.
B. A narrow artery restricts blood flow by increasing blood’s viscosity.
C. The constricted artery causes the pressure gradient to decrease which results
in lower blood flow.
D. The decrease in artery radius will cause blood volume flow rate to decrease.
Pressure Applied to the Cardiovascular System
Pressure Applied to the Cardiovascular System
3. When the AV valve between the left atrium and left ventricle is open, the blood
pressure in both chambers is zero. When the left ventricle contracts, the AV valve
shuts, and blood pressure in the left ventricle rises, while blood pressure in the
left atrium reaches and stays at ~5 mmHg. Blood pressure in the aorta is
~80 mmHg at the end of diastole. Which of the following will happen next?
A. When blood pressure in the left ventricle reaches 6 mmHg, blood will flow
into the left atrium.
B. When blood pressure in the left ventricle reaches 80 mmHg, blood will flow
into the aorta.
C. When blood pressure in the left ventricle reaches 81 mmHg, blood will flow
into the aorta.
D. Blood volume in the left ventricle will decrease as pressure increases until
there is sufficient pressure to push blood into the aorta.
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4. What unit is a blood pressure of 120/80 expressed in?
A. Millimetres of mercury
B. Centimetres of blood
C. Centimetres of mercury
D. Pascals
5. What effect will increasing the concentration of red cells in blood have? It will:
A. Decrease blood viscosity and increase aortic pressure
B. Increase blood viscosity and decrease aortic pressure
C. Increase blood viscosity and increase aortic pressure
D. Decrease blood viscosity and decrease aortic pressure
6. By which means will the sympathetic response raise blood pressure?
A. Vasoconstriction due to stimulation of alpha receptors
B. Vasoconstriction due to stimulation of beta receptors
C. Increased cardiac output due to stimulation of alpha receptors
D. Increased stroke volume due to stimulation of alpha receptors
7. What is a normal pressure in the venous system returning blood to the heart?
A. 35 mmHg
B. 35 cm water
C. 80 mmHg
D. 10 cm water
8. The intravenous cannula that will give the largest flow rate is:
A. 0.7 mm diameter 32 mm length
B. 0.7 mm diameter 19 mm length
C. 1.8 mm diameter 32 mm length
D. 1.8 mm diameter 19 mm length
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9. Consider Pascal’s principle. If the heart exerts a pressure of 120 mmHg on the
blood in the aorta, where else in the body will the blood pressure be 120 mmHg?
A. In the brachial artery of a seated person
B. In the superior vena cava of a standing person
C. In the capillaries of the feet of a supine person
D. In the anterior tibial artery of a person who is standing
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