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_________ glands have vesicles that release their secretion by exocytosis.

A.

Merocrine

B.

Mucous

C.

Holocrine

D.

Endocrine

Answer and Explanation

The Correct Answer is A

A. Merocrine: Merocrine glands secrete their products by exocytosis, where vesicles release substances such as sweat or enzymes without damaging the gland cell. This is the most common method of glandular secretion.

B. Mucous: Mucous glands produce thick, viscous secretions rich in glycoproteins, but the term describes the type of secretion rather than the mechanism. They can still use merocrine exocytosis to release their products.

C. Holocrine: Holocrine glands release their secretion when the entire gland cell ruptures and disintegrates, releasing cell contents along with the secretion. This process is not exocytosis.

D. Endocrine: Endocrine glands release hormones directly into the bloodstream rather than through ducts. They do not use exocytosis of vesicles into ducts, making them different from merocrine glands.


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Related Questions

Correct Answer is A

Explanation

A. mesothelium:Mesothelium is a specialized simple squamous epithelium that lines the serous membranes of body cavities, including the peritoneum, pleura, and pericardium. It provides a smooth, friction-reducing surface and facilitates the movement of organs within these cavities.

B. hyaline epithelium:Hyaline epithelium is not a recognized tissue type. Hyaline typically refers to cartilage, not epithelial tissue, and does not line serous membranes.

C. areolar CT:Areolar connective tissue is a loose connective tissue that supports and cushions organs, but it is not an epithelial layer and does not form the lining of serous membranes.

D. endothelium:Endothelium is a simple squamous epithelium that lines blood vessels and the heart, not serous cavities. It functions primarily in exchange of materials and maintaining vascular homeostasis.

Correct Answer is B

Explanation

A. stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum:This order goes from deepest to superficial. A needle would pierce the layers from superficial to deep, so this sequence is reversed.

B. stratum corneum, stratum granulosum, stratum spinosum, stratum basale:The epidermis is pierced from the outermost layer inward. The stratum corneum is the outer protective layer, followed by the stratum granulosum, stratum spinosum, and finally the stratum basale, which rests on the dermis.

C. stratum granulosum, stratum basale, stratum spinosum, stratum corneum:This order is not sequential either from superficial to deep or deep to superficial, so it does not represent the correct pathway for a needle entering the skin.

D. stratum basale, stratum spinosum, stratum granulosum, stratum corneum:This order lists the layers from deep to superficial, the opposite of how a needle would penetrate the epidermis.

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