Question

question 31
the cell responsible for breaking down the matrix of bone is the ______.
a - osteoblast
b - osteocyte
c - chondrocyte
d - osteoclast

Explanation:

Identify the bone-resorbing cell

Using the Osteoblast Function knowledge point

• Osteoblasts are bone-building cells that secrete the organic bone matrix.
• Osteocytes are mature bone cells housed in lacunae that maintain bone tissue.
• Chondrocytes are cartilage-producing cells, not bone cells.
• Osteoclasts are large, multinucleated cells responsible for bone resorption (breaking down the bone matrix).

Analyze the humeroradial joint articulation

Using the Capitulum Articulation knowledge point

• The cup-like superior surface of the head of the radius articulates with the rounded, marble-like capitulum of the humerus.
• This structural pairing forms the humeroradial joint, which functions as a hinge joint allowing flexion and extension of the forearm, and also participates in the pivot action during pronation and supination of the forearm.

Answer:

Question 31

• A - osteoblast
• B - osteocyte
• C - chondrocyte
• D - osteoclast (Correct answer)

Question 32

The proximal end of the radius illustrates the relationship of form and function. The cup-like surface of the radial head articulates with the rounded shape of the capitulum. This forms a joint that allows for <blank>flexion and extension</blank> (or <blank>pronation and supination</blank>).