Question

question 15
the substance which makes the bone matrix hard:
a collagen
b calcium phosphate
c lamella
d fibrous connective tissue

Explanation:

• Collagen provides flexibility to the bone matrix.
• Calcium phosphate (in the form of hydroxyapatite crystals) is the mineral component that imparts hardness to the bone matrix.
• Lamellae are the concentric layers in bone structure but do not directly make the matrix hard.
• Fibrous connective tissue is not the substance responsible for bone matrix hardness.

Answer:

B. calcium phosphate