Which of the following is not characteristic of lymphatic vessels?
They have thin walls
They can contract to propel lymph
They transport lymph to the tissues
They are blind-ended
The Correct Answer is C
A. They have thin walls – Lymphatic vessels have thin walls, similar to veins, which allow for the passage of lymph.
B. They can contract to propel lymph – Lymphatic vessels do have the ability to contract, aided by smooth muscle and valves, which helps propel lymph in the right direction.
C. They transport lymph to the tissues – This statement is incorrect. Lymphatic vessels carry lymph away from the tissues (not to the tissues) and toward lymph nodes and eventually to the bloodstream.
D. They are blind-ended – Lymphatic capillaries are indeed blind-ended, meaning they begin as closed-ended tubes that absorb interstitial fluid from tissues.
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Related Questions
Correct Answer is B
Explanation
A. Lymphatic capillaries do contain cells, specifically endothelial cells that form the walls of the capillaries.
B. Lymphatic capillaries are blind-ended, meaning they have an open end that begins the collection of interstitial fluid (lymph), unlike blood capillaries, which form continuous loops.
C. Lymphatic capillaries are highly permeable to water, solutes, and larger particles, which is one reason they are efficient at collecting interstitial fluid.
D. Lymphatic capillaries do not contain a muscular layer. Instead, they rely on the surrounding tissues and valves to help move lymph through the system
Correct Answer is C
Explanation
A. Lymph from the lower body drains into the thoracic duct.
B. Lymph from the left side of the head drains into the thoracic duct as well, which eventually empties into the systemic circulation.
C. Lymph from the right arm does not enter the thoracic duct. It drains into the right lymphatic duct, which then empties into the systemic circulation.
D. Lymph from the left arm drains into the thoracic duct along with lymph from other parts of the body.
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