Question

what structure allows the diaphysis of the bone to increase in length?

epiphyseal line
lacunae
osteon
epiphyseal plate

question 38

why are collagen fibers a critical component of bone?

collagen fibers help bone resist twisting, pulling, or stretching forces.
collagen fibers act as \glue\ to bind components together.
collagen fibers help trap water in the ecm.
collagen fibers help the bone resist compression.

Explanation:

Analyze longitudinal bone growth

The first question asks which structure allows the diaphysis of a bone to increase in length.

• The Long Bone Anatomy concept describes the regions of a long bone, including the diaphysis (shaft) and epiphyses (ends).
• During growth, the hyaline cartilage region located between the diaphysis and epiphysis, known as the epiphyseal plate, undergoes rapid mitosis and ossification, allowing the bone to lengthen.
• Once growth stops, this plate ossifies completely and becomes the epiphyseal line.
• Therefore, the active structure allowing growth in length is the epiphyseal plate.

Analyze the role of collagen in bone matrix

The second question asks why collagen fibers are a critical component of bone.

• The Bone Matrix Composition consists of both organic and inorganic components.
• The inorganic matrix (mainly hydroxyapatite crystals) provides hardness and resists compression.
• The organic matrix, primarily composed of collagen fibers, provides tensile strength, flexibility, and resistance to twisting, pulling, or stretching forces (torsional and tensile stress).
• Therefore, collagen fibers help bone resist twisting, pulling, or stretching forces.

Answer:

Question 1

• epiphyseal line
• lacunae
• osteon
• epiphyseal plate (Correct answer)

Question 2

• Collagen fibers help bone resist twisting, pulling, or stretching forces. (Correct answer)
• Collagen fibers act as "glue" to bind components together.
• Collagen fibers help trap water in the ECM.
• Collagen fibers help the bone resist compression.