What is the main reason blood flow is slowest in the capillaries?
Capillaries have to fight the pull of gravity.
Capillaries have a great cross-sectional area.
Capillary blood has a higher viscosity than venous blood.
Capillaries have a higher osmotic pressure.
The Correct Answer is B
Choice A rationale:
Gravity does not significantly affect blood flow in capillaries.
Choice B rationale:
The total cross-sectional area of capillaries is greater than that of other blood vessels, which slows down the blood flow, allowing time for exchange of gases and nutrients.
Choice C rationale:
While blood viscosity can affect blood flow, it is not the main reason for slow blood flow in capillaries.
Choice D rationale:
Capillaries do not have higher osmotic pressure than other blood vessels.
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Related Questions
Correct Answer is {"dropdown-group-1":"B"}
Explanation
Choice A rationale:
Peyer’s patches are lymphoid nodules located in the small intestine and play a role in immune surveillance of the intestinal lumen and in the facilitation of the immune response.
Choice B rationale:
The appendix serves as a reservoir for beneficial gut bacteria. It is a narrow pouch that projects off the cecum in the digestive system.
Choice C rationale:
Adenoids are not known to serve as a reservoir for beneficial gut bacteria. They are located in the upper part of the throat and are part of the immune system, helping to fight off infections and trap bacteria that enter through the nose.
Choice D rationale:
Tonsils are not known to serve as a reservoir for beneficial gut bacteria. They are lymphoid tissues located at the back of the throat and help protect the body from respiratory infections.
Correct Answer is A
Explanation
Choice A rationale:
Capillaries are the smallest blood vessels that connect arteries and veins. They allow nutrients in the blood to diffuse to the body’s tissues.
Choice B rationale:
Arteries carry oxygen-rich blood from the heart to the tissues of the body. They do not connect the two sides of the vascular system.
Choice C rationale:
Venules are very small blood vessels that connect capillaries with veins throughout the body. They do not connect the two sides of the vascular system.
Choice D rationale:
Veins carry blood back toward the heart. They do not connect the two sides of the vascular system
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