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Tissues that usually do not undergo mitosis as an adult but can due to a traumatic injury would consist of cells that are considered_______ and an example of this type of tissue would be ________

A.

stable: epithelium

B.

permanent; nervous

C.

stable; liver

D.

permanent; liver

E.

labile; epithelium

Answer and Explanation

The Correct Answer is C

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.


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Related Questions

Correct Answer is C

Explanation

A. UV radiation
UV exposure stimulates melanocytes to increase melanin production, leading to tanning and darker pigmentation.

B. pregnancy
Hormonal changes during pregnancy, particularly estrogen and MSH, can increase pigmentation, such as in melasma (the "mask of pregnancy").

C. melanocyte stimulating hormone increased number of melanocytes
MSH stimulates melanin production, not the number of melanocytes. The number of melanocytes remains relatively stable in most individuals.

D. increased production of dark melanin
More production of eumelanin (dark melanin) leads to increased pigmentation, seen in individuals with darker skin tones or increased melanin activity.

Correct Answer is B

Explanation

A. vitamin A
Vitamin A plays a role in bone remodeling, but excess vitamin A can cause bone fragility. It’s not the first recommendation in cases of brittle bones.

B. vitamin D
Vitamin D helps the body absorb calcium from the digestive tract. A deficiency can lead to osteomalacia (soft bones) or osteoporosis (brittle bones), and also contributes to tooth decay.

C. vitamin C
Vitamin C is needed for collagen synthesis, which is important in bone matrix formation, but deficiency leads to scurvy, not typically brittle bones and teeth loss in this context.

D. vitamin E
Vitamin E is an antioxidant but does not have a primary role in bone or dental health.

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