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 C
Explanation
A. stable; epithelium: Epithelium consists of labile cells, not stable ones. These cells divide frequently even without injury.
B. permanent; nervous: Nervous tissue is considered permanent, and neurons generally do not regenerate or undergo mitosis even after injury.
C. stable; liver: Stable cells do not divide under normal conditions but can be stimulated to divide after injury. Liver cells are a classic example.
D. permanent; liver: In The liver is capable of regeneration and therefore has stable, not permanent, cells.
E. labile; epithelium: This is a true match, but it does not answer the question asked. Labile cells divide regularly and are not "usually non-mitotic" as the question specifies.
Correct Answer is B
Explanation
A. the sweat glands released their product, causing the hair to grow
Hair does not grow postmortem, and sweat gland activity ceases after death.
B. the skin retracted from the hair follicles
After death, the skin dehydrates and shrinks, which can cause the hair shaft to appear longer, giving the illusion that hair has grown, even though it hasn't.
C. during the process of decomposition, the hairs grew out of the follicles
Hair cannot grow after death because cellular metabolism and mitosis cease.
D. the skin grew out, forcing the hair out of the follicles
Skin does not grow postmortem; this is scientifically inaccurate.
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