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Where would be the BEST place to find red marrow in an adult?

A.

in the medullary cavity of a long bone

B.

in the epiphysis of a flat bone

C.

in the medullary cavity of a flat bone

D.

in the epiphysis of a long bone

E.

in the epiphyseal plate of a long bone

Answer and Explanation

The Correct Answer is D

A. in the medullary cavity of a long bone
In adults, the medullary cavity contains yellow marrow, not red marrow.

B. in the epiphysis of a flat bone
Flat bones (e.g., skull) don’t have epiphyses. This answer is anatomically inaccurate.

C. in the medullary cavity of a flat bone
Flat bones don’t have a true medullary cavity. Red marrow is found in their spongy bone, not in a central cavity.

D. in the epiphysis of a long bone
Red marrow in adults is found in the spongy bone of the epiphyses of long bones and in flat bones like the sternum and pelvis.

E. in the epiphyseal plate of a long bone
The epiphyseal plate is made of cartilage, not marrow. It is involved in growth, not hematopoiesis.


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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 E

Explanation

A. mesenchyme
Mesenchyme is a type of embryonic connective tissue from which all adult connective tissues develop. It has a fluid matrix and undifferentiated cells.

B. osteochondral
This is nota recognized fetal stem tissue type. It refers more to regions with both bone and cartilage precursors, but it's not a stem connective tissue.

C. mucous
Mucous connective tissue, found in the umbilical cord (Wharton's jelly), is another type of fetal stem connective tissue.

D. A & B
Mesenchyme is correct, but osteochondral is not a true fetal stem connective tissue.

E. A & C
Both mesenchyme and mucous connective tissue are fetal connective tissues with stem-like properties.

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