DAT Reading Comprehension Quiz
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PASSAGE UNDERSTANDING
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PASSAGE
The human body's ability to remodel bone is a dynamic, lifelong process crucial for maintaining skeletal integrity. This process, orchestrated by two primary cell types, osteoclasts and osteoblasts, involves the sequential resorption of old bone and formation of new bone. Osteoclasts are large, multinucleated cells that adhere to the bone surface and secrete acids and enzymes, dissolving the mineral and organic components in a process called resorption. Following this, osteoblasts, the bone-forming cells, migrate to the resorbed site. They synthesize and secrete a protein mixture known as osteoid, which is primarily composed of type I collagen. This osteoid matrix is subsequently mineralized with calcium phosphate, forming new, rigid bone tissue. The delicate balance between osteoclast and osteoblast activity, known as bone coupling, is essential; its dysregulation can lead to metabolic bone diseases such as osteoporosis, where resorption outpaces formation.
The author's main objective in this passage is to:
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