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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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["Acetabulum"]
Explanation
acetabulum is the concave cavity located on the lateral surface of the hip bone.
It is formed by the fusion of the ilium, ischium, and pubis bones.
The acetabulum articulates with the head of the femur to form the hip joint, which is a ball-and-socket joint that allows for a wide range of movement.
The acetabulum is lined with articular cartilage, which provides a smooth surface for the head of the femur to move against.
The acetabulum is also surrounded by a fibrocartilaginous ring called the acetabular labrum, which deepens the socket and helps to stabilize the hip joint.
Injuries to the acetabulum can result in hip dislocations or fractures, which can be very painful and require medical intervention.
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.
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