You are collecting and analyzing the secretions of a gland and you find phospholipids. The gland could be all of the following except:
apocrine
merocrine
sebaceous
holocrine
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. hemidesmosomes: These anchor epithelial cells to the basement membrane, not for communication.
B. desmosomes: Desmosomes are responsible for mechanical adhesion between cells, providing strength but not facilitating communication.
C. gap junctions: These allow ions and small molecules to pass directly from one cell to another, enabling rapid cell-to-cell communication, especially in cardiac and smooth muscle.
D. tight junctions: These seal adjacent cells together to prevent leakage of substances between them, rather than enabling communication.
Correct Answer is B
Explanation
A. circumferential lamellae
These are outer and inner rings that encircle the entire compact bone structure, not the rings within an osteon.
B. concentric lamellae
These are the circular layers of bone matrix surrounding the central (Haversian) canal within each osteon.
C. interstitial lamellae
These are incomplete lamellae found between osteons, representing old osteons that have been partially resorbed.
D. sequential lamellae
This is not a valid anatomical term used to describe lamellae in bone.
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