Which type of cell is responsible for breaking down bone tissue?
Osteoclast.
Chondrocytes.
Osteocytes.
Osteoblast.
The Correct Answer is A
Osteoclasts are the type of cells that break down bone tissue by secreting acid and enzymes.
They are derived from monocytes and macrophages, two types of white blood cells.
Choice B is incorrect because chondrocytes are the cells that produce and maintain cartilage, a flexible connective tissue found in joints.
Choice C is incorrect because osteocytes are the mature bone cells that maintain the mineral concentration of the bone matrix.
They are derived from osteoblasts, the bone-forming cells.
Choice D is incorrect because osteoblasts are the cells that form new bone by synthesizing and secreting collagen and calcium salts.
They are derived from osteogenic cells, the undifferentiated cells that can divide.
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Related Questions
Correct Answer is C
Explanation
Osteoclasts are the type of cells that increase their activity in response to parathyroid hormone (PTH) and break down bone tissue to release calcium into the blood.
PTH helps maintain the right balance of calcium in the body by stimulating osteoclasts.
Choice A is incorrect because osteoblasts are the type of cells that form new bone tissue by depositing calcium into the bone matrix.
PTH inhibits osteoblasts and reduces bone formation.
Choice B is incorrect because canaliculi are not cells, but small channels within the bone matrix that allow osteocytes to communicate with each other and exchange nutrients and waste.
PTH does not affect canaliculi directly.
Choice D is incorrect because osteocytes are the type of cells that are mature bone cells trapped within the bone matrix.
PTH can stimulate osteocytes to release calcium from the bone, but not as much as osteoclasts.
Correct Answer is ["thoracic costal facet"]
Explanation
The thoracic costal facet is a feature found on the thoracic vertebrae, which are the bones that make up the mid-back region of the spine.
The costal facet is a small, flat surface located on the transverse process of the thoracic vertebrae, where it articulates with the head of the rib.
There are two costal facets on each thoracic vertebra, one on the transverse process and one on the body of the vertebra.
The costal facet is an important anatomical feature as it provides stability and support to the rib cage and facilitates the movements of the thoracic spine during respiration and other activities.
Injuries to the costal facet can result in rib fractures or dislocations, which can be very painful and require medical intervention.
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