Advanced Dental Admission Test (ADAT)

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What is the function of osteoprotegerin in bone physiology?

  1. Stimulates bone resorption

  2. Serves as a decoy receptor for RANKL

  3. Promotes osteoclast differentiation

  4. Increases calcium reabsorption

The correct answer is: Serves as a decoy receptor for RANKL

Osteoprotegerin plays a significant role in bone physiology by acting as a decoy receptor for RANKL (Receptor Activator of Nuclear factor Kappa-B Ligand). RANKL is a critical molecule that promotes the differentiation and activation of osteoclasts, the cells responsible for bone resorption. When osteoprotegerin binds to RANKL, it inhibits the RANKL/RANK interaction, leading to a decrease in the formation and activity of osteoclasts. This mechanism helps to maintain bone density by reducing bone resorption, allowing for a balance between bone formation and bone loss. In normal physiological conditions, the balance between osteoprotegerin and RANKL is crucial for maintaining healthy bone metabolism. When osteoprotegerin levels are sufficient, they help to protect against excessive bone loss, whereas low levels can lead to increased bone resorption and conditions such as osteoporosis. Understanding the function of osteoprotegerin is vital for comprehending how the body regulates its skeletal system and prevents bone diseases.

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