MCAT Biology Question 155: Answer and Explanation
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Question: 155
5. Which of the following cells is correctly coupled with its definition?
- A. Osteoblasts—bone cells involved in the secretion of bone matrix
- B. Osteoclasts—immature bone cells
- C. Osteocytes—polynucleated cells actively involved in bone resorption
- D. Chondrocytes—undifferentiated bone marrow cells
Correct Answer: A
Explanation:
Let's quickly define each one of the four cells discussed in the answer choices. Osteoblasts are bone cells involved in the secretion of bone matrix, as choice (A) states. Osteoclasts are large, polynucleated cells involved in bone resorption. Osteocytes are mature bone cells that eventually become surrounded by their matrix; their primary role is bone maintenance. Finally, chondrocytes are cells that secrete chondrin, an elastic matrix that makes up cartilage.