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The inorganic portion of the matrix is composed of ______ and the organic is composed of _______

A.

collagen, organic phosphate

B.

calcium phosphate compound, osteoblasts and osteocytes

C.

collagen, calcium phosphate compound

D.

collagen, osteoblasts and osteocytes

E.

calcium phosphate compound, collagen

Answer and Explanation

The Correct Answer is E

A. collagen, organic phosphate
This mixes the categories. Collagen is organic, and "organic phosphate" isn’t the correct term for bone mineral content.

B. calcium phosphate compound, osteoblasts and osteocytes
Osteoblasts and osteocytes are cells, not part of the organic matrix. The organic matrix is composed of proteins, primarily collagen.

C. collagen, calcium phosphate compound
This reverses the correct order. Calcium phosphate is inorganic, collagen is organic.

D. collagen, osteoblasts and osteocytes
Again, includes cells instead of matrix materials.

E. calcium phosphate compound, collagen
The inorganic matrix = hydroxyapatite (a calcium phosphate crystal). The organic matrix = collagen fibers, which give tensile strength and flexibility


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Related Questions

Correct Answer is C

Explanation

A. an inability to lay down new bone
Bone formation is the role of osteoblasts, not osteoclasts.

B. an inability to lay down cartilage
Cartilage is formed by chondroblasts, unrelated to osteoclasts.

C. an inability to regulate calcium
Osteoclasts resorb bone, releasing calcium into the bloodstream. Defective osteoclasts impair this process, disrupting calcium homeostasis.

D. an inability to create matrix
Osteoclasts break down bone matrix, they don’t create it. Matrix creation is done by osteoblasts.

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.

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