Question at position 19 The ______ contains blood and lymphatic vessels and plays a key role in nutrient transport and immune defense.EpitheliumMuscularis mucosaeLamina propriaMucosal layer单项选择题
A
Epithelium
B
Muscularis mucosae
C
Lamina propria
D
Mucosal layer

Question

Question at position 19 The ______ contains blood and lymphatic vessels and plays a key role in nutrient transport and immune defense.EpitheliumMuscularis mucosaeLamina propriaMucosal layer

BlackTom AI · Accepted Answer

To tackle the question, I’ll evaluate what each listed option represents within the mucosa.
Option 1: Epithelium. The epithelial layer lines the surface and forms a barrier, but it does not contain blood or lymphatic vessels. Nutrient exchange and immune interactions typically occur through underlying tissues, not within the epithelium itself, so this choice is incorrect.
Option 2: Muscularis mucosae. This is a thin layer of smooth muscle beneath the lamina propria that helps move the mucosa. It does not house blood vessels or lymphatics, so it cannot be the structure described. Therefore, this is not the right option.
Option 3: Lamina propria. This is a loose connective tissue layer that indeed contains both blood vessels and lymphatic vessels, supporting nutrient transport and providing immune defense via resident immune cells. It matches the description in the question, making it the correct choice.
Option 4: Mucosal layer. While the mucosa as a whole includes epithelium, lamina propria, and muscularis mucosae, referring to it as a single layer here is imprecise. The phrase "mucosal layer" is less specific about containing vessels, whereas the lamina propria explicitly designates the vessel-rich connective tissue layer described. Hence this option is not the precise answer.
In summary, while the epithelium and muscularis mucosae are components of the mucosa, they do not contain the blood and lymphatic networks described. The lamina propria uniquely satisfies the requirement by housing these vessels and contributing to nutrient transport and immune defense. The broad term 'mucosal layer' is too general to pinpoint the exact histological structure in question.

Question at position 19 The ______ contains blood and lymphatic vessels and plays a key role in nutrient transport and immune defense.EpitheliumMuscularis mucosaeLamina propriaMucosal layer单项选择题

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