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Which epithelial membranes protect by forming a lining for all passages that are open to the exterior of the body?

A.

Serous

B.

Cutaneous

C.

Mucous

D.

Synovial

Answer and Explanation

The Correct Answer is C

A. Serous: Serous membranes line closed body cavities (e.g., pericardium, pleura, peritoneum) and do not open to the exterior.

B. Cutaneous: The cutaneous membrane is the skin, which covers the body but does not line internal passages.

C. Mucous: Mucous membranes line body cavities and passages that are open to the external environment, such as the respiratory, digestive, and urogenital tracts.

D. Synovial: Synovial membranes line joint cavities and produce synovial fluid for lubrication, but they do not line external body passages.


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Related Questions

Correct Answer is B

Explanation

A. Mucous: Mucous membranes line cavities that open to the exterior, such as the respiratory, digestive, and urinary tracts.

B. Serous: Serous membranes line body cavities (such as the peritoneum, pleura, and pericardium) that do not open to the outside and produce serous fluid to reduce friction between organs.

C. Cutaneous: The cutaneous membrane is the skin, which covers the external body surface.

D. Synovial: Synovial membranes line joint cavities and secrete synovial fluid to lubricate the joints.

Correct Answer is D

Explanation

A. Bilirubin: Bilirubin is a yellow pigment derived from the breakdown of red blood cells, associated with jaundice rather than freckles or moles.

B. Carotene: Carotene is an orange pigment found in foods like carrots and can contribute to skin tone but is not the main factor in moles or vitiligo.

C. Keratin: Keratin is a structural protein found in skin, hair, and nails but does not influence pigmentation.

D. Melanin: Melanin is the pigment responsible for skin color, moles, freckles, and conditions like vitiligo, which causes depigmentation.

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