Final answer:
d. pressure The factor that promotes bone resorption is pressure. This is because mechanical pressure stimulates osteoclast activity, leading to increased resorption, while PTH raises serum calcium by promoting osteoclasts when blood calcium is low.
Step-by-step explanation:
The student has asked which of the following promotes bone resorption. The correct answer is d. pressure. Bone resorption is a natural process by which osteoclasts break down bone tissue and release the minerals, resulting in a transfer of calcium from bone tissue to the blood. Mechanical pressure or stress on bones can stimulate osteoclasts and result in increased bone resorption. Conversely, activities such as exercise, which typically place mechanical stress on bones, actually promote bone deposition of minerals rather than resorption.
Parathyroid hormone (PTH) plays a critical role in regulating calcium levels in the blood. When blood calcium levels are low, PTH is released, which then stimulates osteoclasts to increase bone resorption, thereby mobilizing calcium from bones to increase serum calcium levels.Proper nutrition, including a calcium-rich diet and sufficient vitamin D, supports bone health by enhancing calcium absorption in the intestines and preventing excessive bone resorption.Bone resorption is the process of breaking down bone tissue. It is primarily carried out by cells called osteoclasts. When blood calcium levels are low, parathyroid hormone (PTH) stimulates the release of calcium from bones by promoting the activity of osteoclasts. Therefore, the correct answer is d. osteoclasts.