Cardiovascular System
Say a diastolic blood pressure reading was 80 mm Hg. This is consistent with which one of the following statements?
The diastolic reading is 80 mmHg greater than atmospheric pressure.
Pressure is measured in length units.
The diastolic reading is 80 mmHg less than atmospheric pressure.
This is the maximum pressure produced by contraction of the myocardium.
The diastolic reading is 80 mmHg greater than atmospheric pressure.
Because atmospheric pressure (about 760 mmHg) is always present, it is taken to be a “relative zero”, and other pressures are stated as an amount greater than atmospheric pressure. We say 80 implying 80 more than 760, rather than stating 840 mmHg (760 + 80).
The diastolic reading is 80 mmHg greater than atmospheric pressure. Because atmospheric pressure (about 760 mmHg) is always present, it is taken to be a “relative zero”, and other pressures are stated as an amount greater than atmospheric pressure. We say 80 implying 80 more than 760, rather than stating 840 mmHg (760 + 80).
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By what name is the heart muscle known?A. Epicardium
B. Myocardium
C. Pericardium
D. Endocardium
Which statement about cardiac output is correct?
A. Cardiac output is peripheral resistance multiplied by stroke volume.
B. Mean arterial pressure multiplied by peripheral resistance is cardiac output.
C. Cardiac output is heart rate multiplied by stroke volume.
D. Cardiac output is blood volume multiplied by heart rate.
What is “systolic pressure”?
A. The peak pressure in the blood due to contraction of the left ventricle.
B. The minimum pressure in the blood prior to contraction of the left ventricle.
C. It may be obtained by multiplying cardiac output by total peripheral resistance.
D. It is also known as mean arterial pressure.
A statement of Boyle’s law could be:
A. As pressure of a gas increases, its solubility increases.
B. As volume of a gas increases, its pressure decreases.
C. As volume of a gas decreases, its pressure decreases.
D. As pressure of a gas increases, its solubility decreases.
Which of the following is not a type of white blood cell?
A. Leucocyte
B. Eosinophil
C. Erythrocyte
D. Neutrophil
Consider Boyle’s law. If the pressure being exerted on an enclosed volume of gas (at a constant temperature) is increased by 20%, by what percentage would its volume change?
A. Volume would increase by 20%.
B. Volume would increase by 44%.
C. Volume would decrease by 44%.
D. Volume would decrease by 20%.
Through which valve does blood flow when it moves from the left atrium into the left ventricle?
A. The semilunar valve
B. The mitral valve
C. The tricuspid valve
D. The aortic valve
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