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Endochondral ossification

A.

forms the parietal and frontal bones

B.

results when the mesenchyme condenses into a fibrous CT around brain

C.

occurs when bones develop from cartilage models

D.

occurs when multiple centers of ossification converge together

Answer and Explanation

The Correct Answer is C

A. forms the parietal and frontal bones
These bones are formed by intramembranous ossification, not endochondral. Intramembranous ossification occurs directly from mesenchyme.

B. results when the mesenchyme condenses into a fibrous CT around brain
This describes intramembranous ossification, not endochondral. Endochondral ossification uses a cartilage model, not fibrous connective tissue.

C. occurs when bones develop from cartilage models
Endochondral ossification is the process by which long bones and most bones of the body are formed by replacing a hyaline cartilage model with bone.

D. occurs when multiple centers of ossification converge together
While multiple ossification centers do form during endochondral ossification (e.g., primary in diaphysis, secondary in epiphyses), this does not define the process-it’s development from a cartilage model that is essential.


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Related Questions

Correct Answer is D

Explanation

A. parathyroid hormone is released, decreasing osteoclast activity
Parathyroid hormone (PTH) is released when calcium levels are low, not high. Also, PTH increases, not decreases, osteoclast activity to raise serum calcium.

B. calcitonin hormone is released, increasing osteoclast activity
Calcitonin is released during high calcium levels, but it works to decrease osteoclast activity, not increase it.

C. parathyroid hormone is released, increasing osteoclast activity
This would occur in response to low calcium, which is not the case here. Mary has excess calcium.

D. calcitonin hormone is released, decreasing osteoclast activity
With elevated calcium levels, the thyroid gland releases calcitonin, which works to inhibit osteoclasts to reduce calcium release from bone, helping to restore balance.

Correct Answer is C

Explanation

A. thin skin has five strata
Thin skin has only four strata and lacks the stratum lucidum, which is present only in thick skin (e.g., palms and soles).

B. thin and thick skin have abundant hair follicles
Thick skin lacks hair follicles entirely. Hair is present only in thin skin.

C. thick contains a stratum lucidum, corneum & granulosum
These three layers are prominent in thick skin, providing extra protection in high-friction areas like palms and soles.

D. thick is more widely distributed than thin
Thin skin is more widely distributed over the body. Thick skin is limited to palms and soles.

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