Cardiovascular System
What is meant by the statement that the amount of dissolved O2 in blood is 100 mmHg?
The oxygen dissolved in blood contributes 100 mmHg to the blood pressure.
It is a statement of the concentration of dissolved oxygen in the solution.
Blood has been in close contact with air that had contained oxygen at a partial pressure of 100 mmHg.
The part of blood’s osmotic pressure that is due to dissolved oxygen is 100 mmHg.
Blood has been in close contact with air that had contained oxygen at a partial pressure of 100 mmHg.
When a liquid is in contact with a mixture of gases, the amount of a gas that will dissolve in the liquid (at equilibrium) is stated as the partial pressure of that gas in the mixture. Hence if there is 100 mmHg of dissolved O2 in a liquid, then the gas that was in contact with the liquid must have contained oxygen at a partial pressure of 100 mmHg. Choice B is also correct but not as good an answer as C. Choices A and D are nonsense.
Blood has been in close contact with air that had contained oxygen at a partial pressure of 100 mmHg. When a liquid is in contact with a mixture of gases, the amount of a gas that will dissolve in the liquid (at equilibrium) is stated as the partial pressure of that gas in the mixture. Hence if there is 100 mmHg of dissolved O2 in a liquid, then the gas that was in contact with the liquid must have contained oxygen at a partial pressure of 100 mmHg. Choice B is also correct but not as good an answer as C. Choices A and D are nonsense.
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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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