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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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Lung contains alveolar macrophages (dust cells), not Kupffer cells.
B. Spleen contains various types of immune cells, but Kupffer cells are not found here.
C. Kupffer cells are specialized macrophages located in the liver. They play a role in filtering blood and removing pathogens, debris, and worn-out blood cells.
D. Tonsils contain lymphocytes and other immune cells, but Kupffer cells are not found in the tonsils.
Correct Answer is C
Explanation
A. Interferon is a type of protein produced by the body in response to infections, particularly viral infections. It is not related to allergens.
B. Macrophage is a type of white blood cell that engulfs and digests pathogens, dead cells, and other debris. It is not an allergen.
C. An allergen is a substance that triggers an allergic reaction. It is considered a type of antigen—a foreign substance that the immune system recognizes and reacts to, often causing symptoms like inflammation, swelling, or itching in allergic individuals.
D. Antibody is a protein produced by B cells that binds to specific antigens, but it is not an allergen.
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