Which type of cell connection allows for direct cell to cell communication?
hemidesmosomes
desmosomes
gap junctions
tight junctions
The Correct Answer is C
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.
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Related Questions
Correct Answer is A
Explanation
A. terminal; vellus
Terminal hairs are thick and pigmented. During puberty, hairs typically change from vellus to terminal, not the reverse.
B. lanugo; vellus
Lanugo is the fine hair present on fetuses, not typical of pre-pubertal facial hair.
C. vellus; lanugo
This is also in Lanugo is not a stage in puberty; it is lost after birth.
D. lanugo; terminal
While terminal hair is correct, lanugo is irrelevant in this pubertal context.
E. vellus; terminal
During puberty, vellus hair (fine and lightly pigmented) on the face is replaced by terminal hair (thicker, darker, and coarser) under the influence of androgens.
Correct Answer is C
Explanation
A. hyaline cartilage: Hyaline cartilage contains fine collagen fibers, but not densely packed ones. It is more glassy and smooth, found in the nose, trachea, and at joint surfaces.
B. areolar cartilage: This is not a valid type of cartilage. “Areolar” refers to loose connective tissue, not cartilage.
C. fibrocartilage: This type of cartilage is rich in dense bundles of collagen, making it very tough and resistant to compression. It’s found in intervertebral discs and the pubic symphysis.
D. elastic cartilage: Elastic cartilage contains more elastic fibers than collagen, allowing flexibility. It is found in the ear and epiglottis.
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