Select the correct statement about blood flow. It is greatest where resistance is highest. Blood flow through the entire vascular system is equivalent to cardiac output. It is measured in mm Hg. It is relatively constant through all body organs. It reduces significantly with age.
Question
Select the correct statement about blood flow. It is greatest where resistance is highest. Blood flow through the entire vascular system is equivalent to cardiac output. It is measured in mm Hg. It is relatively constant through all body organs. It reduces significantly with age.
Solution
The correct statement about blood flow is "Blood flow through the entire vascular system is equivalent to cardiac output."
Here's why:
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"It is greatest where resistance is highest." - This statement is incorrect. According to the law of fluid dynamics, flow is inversely proportional to resistance. Therefore, where resistance is highest, flow is actually the lowest.
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"Blood flow through the entire vascular system is equivalent to cardiac output." - This statement is correct. Cardiac output, which is the volume of blood the heart pumps per minute, is indeed equivalent to the blood flow through the entire vascular system.
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"It is measured in mm Hg." - This statement is incorrect. Blood pressure is measured in millimeters of mercury (mm Hg), not blood flow.
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"It is relatively constant through all body organs." - This statement is incorrect. Blood flow varies among different body organs depending on the metabolic activity and needs of the organ.
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"It reduces significantly with age." - This statement is incorrect. While it's true that blood vessels can become less flexible with age, leading to potential issues with blood flow, it's not accurate to say that blood flow reduces significantly with age in a healthy individual.
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