Bone-forming cells are called:
osteoblasts
bone marrow
osteoclasts
osteocytes
The Correct Answer is A
Rationale:
A. Osteoblasts are specialized bone-forming cells responsible for producing new bone tissue. They secrete collagen and other components of the bone matrix and play a vital role in bone growth, repair, and remodeling. Once trapped in the matrix they secrete, osteoblasts mature into osteocytes.
B. This is a soft tissue found inside bones that is involved in the production of blood cells (red, white, and platelets in red marrow) and fat storage (in yellow marrow). It is not a type of bone cell.
C. These are large, multinucleated cells responsible for bone resorption (breaking down bone tissue). They work in balance with osteoblasts to remodel and maintain healthy bone structure.
D. Osteocytes are mature bone cells that originate from osteoblasts once they become embedded in the bone matrix. They maintain bone tissue but do not actively form new bone.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Rationale:
A. Melanin production protects against ultraviolet (UV) radiation but does not directly prevent bacterial entry.
B. Sensory perception allows detection of touch, pressure, pain, and temperature, but it does not serve as a barrier against pathogens.
C. The skin acts as a physical and chemical barrier, preventing bacteria, viruses, and other pathogens from entering the body. Its intact epidermis, along with secretions such as sweat and sebum, helps maintain this protective function.
D. Filtration is a function associated with organs like the kidneys, not the skin.
Correct Answer is C
Explanation
Rationale:
A. Osteocyte is a mature bone cell that maintains bone tissue, but it is not the structural unit of bone.
B. Lacunae are small cavities within the bone matrix that house osteocytes, not the entire structural framework.
C. Osteon (Haversian system) is the basic structural and functional unit of compact bone. It consists of concentric lamellae surrounding a central (Haversian) canal, providing strength and support.
D. Canaliculi are tiny channels that connect lacunae and allow for nutrient and waste exchange between osteocytes, but they are only part of the osteon, not the full unit.
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