Question

question 10
1 part | -- of 1 point

which statement is true regarding calcium in bone matrix?
calcium is found in crystals called hydroxyapatite.
calcium is the organic part of the matrix.
calcium is secreted by osteoblasts into the matrix.
once deposited, calcium cannot be removed from bone.
calcium provides flexibility to the bone matrix.

Explanation:

Calcium in bone matrix is present in the form of crystals called hydroxyapatite. Osteoblasts secrete the organic part of the matrix (collagen - like proteins), not just calcium. Calcium can be removed from bone through processes like bone resorption. Calcium provides hardness rather than flexibility to the bone matrix.

Answer:

Calcium is found in crystals called hydroxyapatite.