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. 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.
Correct Answer is A
Explanation
A. squamous cell carcinoma
This cancer arises from the keratinocytes of the stratum spinosum, often due to UV damage, and can metastasize if not treated early.
B. melanoma
Melanoma arises from melanocytes, which are found in the stratum basale, not the stratum spinosum.
C. basal cell carcinoma
This cancer originates from basal cells of the stratum basale, the deepest layer of the epidermis.
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