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You are collecting and analyzing the secretions of a gland and you find phospholipids. The gland could be all of the following except:

A.

apocrine

B.

merocrine

C.

sebaceous

D.

holocrine

Answer and Explanation

The Correct Answer is B

A. apocrine: Apocrine glands release part of their cytoplasm with the secretion, which can include membrane-bound substances like phospholipids.

B. merocrine: Merocrine glands secrete products via exocytosis without releasing any cytoplasm or membrane material. Their secretions do not contain phospholipids.

C. sebaceous: Sebaceous glands are holocrine glands that release the entire cell contents, including membrane lipids such as phospholipids.

D. holocrine: These glands release whole cells that disintegrate, leading to secretions rich in lipids, including phospholipids.


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Related Questions

Correct Answer is D

Explanation

A. collagen
Collagen provides tensile strength and structural support in connective tissues but is not water-resistant or as hard as keratin.

B. elastic
Elastic fibers allow tissues to stretch and recoil. They are not hard or water-resistant.

C. hyaluronic acid fibrin
Hyaluronic acid is a glycosaminoglycan important for hydration in connective tissue; fibrin is a clotting protein. Neither is a hard, water-resistant structural protein.

D. keratin
Keratin is a fibrous protein found in skin, hair, and nails. It provides a tough, water-resistant barrier on the outer skin (especially in the stratum corneum).

Correct Answer is A

Explanation

A. tightly packed cells: Epithelial tissue consists of cells that are closely packed together with minimal extracellular space, forming continuous sheets that cover surfaces or line cavities. This allows for effective protection, absorption, and secretion.

B. extensive extracellular matrix: This is characteristic of connective tissue, not epithelial tissue. Epithelial tissue has very little extracellular matrix.

C. a rich blood supply: Epithelial tissues are avascular, meaning they lack a direct blood supply. They receive nutrients via diffusion from underlying connective tissue.

D. presence of lacunae: Lacunae are small spaces that contain cells in cartilage or bone tissue, not epithelial tissue.

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