Which of the following correctly matches the bone cell with its primary function?
Osteoclast-builds new bone
Chondrocyte-breaks down bone tissue
Osteoblast-maintains bone matrix
Osteocyte-monitors and maintains bone tissue
The Correct Answer is D
A. Osteoclast — builds new bone: Osteoclasts are large multinucleated cells that resorb (break down) bone matrix during remodeling rather than building new bone.
B. Chondrocyte — breaks down bone tissue: Chondrocytes produce and maintain cartilage matrix and do not directly break down bone tissue.
C. Osteoblast — maintains bone matrix: Osteoblasts synthesize and secrete osteoid (new bone matrix) and initiate mineralization; maintenance of the mature matrix is primarily the role of osteocytes.
D. Osteocyte — monitors and maintains bone tissue: Osteocytes are mature bone cells embedded in matrix that act as mechanosensors and help regulate mineral homeostasis and maintenance of bone tissue.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Secretion of sebum:Sebaceous glands secrete sebum, an oily substance that lubricates and helps waterproof the skin and hair.
B. Production of melanin:Melanin is produced by melanocytes in the epidermis rather than by sebaceous glands.
C. Protection against UV radiation:Protection from UV radiation is mainly provided by melanin produced by epidermal melanocytes, not by sebaceous gland secretions.
D. Temperature regulation:Temperature regulation is achieved primarily through eccrine sweat glands and cutaneous blood flow, not by sebaceous gland activity.
Correct Answer is C
Explanation
A. Fibrocartilaginous callus formation:Fibrocartilaginous callus formation is an early reparative stage that follows hematoma organization, helping bridge the fracture but does not occur first.
B. Formation of a bony callus:Formation of a bony (ossified) callus occurs after the fibrocartilaginous callus is replaced by woven bone during repair.
C. Hematoma formation:Hematoma formation occurs immediately after the fracture as blood vessels rupture, creating a clot that initiates inflammation and brings cells needed for healing.
D. Remodeling of bone:Remodeling is the final phase in which woven bone is replaced by lamellar bone and the medullary canal is restored; it occurs well after initial healing.
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