Question

the predominant ingredient of the inorganic matrix of bone is calcium salts, with the majority existing as large molecules of hydroxyapatite crystals.

true
false

question 50

the epiphyseal plate is a layer of compact bone from which longitudinal growth occurs.

true
false

Explanation:

Analyze the first statement

The first statement states: "The predominant ingredient of the inorganic matrix of bone is calcium salts, with the majority existing as large molecules of hydroxyapatite crystals."

• Bone extracellular matrix consists of organic components (mostly collagen fibers) and inorganic components (mineral salts).
• The inorganic matrix is indeed predominantly composed of calcium phosphate salts.
• These calcium salts combine with other minerals to form crystals of hydroxyapatite, \(Ca_{10}(PO_4)_6(OH)_2\).
• Therefore, this statement is biologically accurate.

Analyze the second statement

The second statement (labeled Question 50) states: "The epiphyseal plate is a layer of compact bone from which longitudinal growth occurs."

• The epiphyseal plate (growth plate) is a hyaline cartilage plate located in the metaphysis at each end of a long bone.
• It is composed of active hyaline cartilage, not compact bone.
• Longitudinal bone growth occurs through endochondral ossification within this cartilaginous plate. Once growth stops, the cartilage is completely replaced by bone, leaving behind the epiphyseal line.
• Because the statement describes the epiphyseal plate as a layer of "compact bone" rather than hyaline cartilage, the statement is false.

Answer:

Question 1

• True (Correct answer)
• False

Question 2

• True
• False (Correct answer)