Parathyroid hormone leads to an increase in blood calcium levels through increased activity in what cells?
Osteoblasts.
Canaliculi.
Osteoclasts.
Osteocytes.
The Correct Answer is C
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["obturator foramen"]
Explanation
The obturator foramen is a large opening in the pelvis that is formed by the ischium and pubis bones.
It is located in the lower part of the pelvis, below the acetabulum (the socket of the hip joint).
The obturator foramen is covered by the obturator membrane, which separates the pelvic cavity from the thigh.
Several important structures pass through or around the obturator foramen, including the obturator nerve, artery, and vein.
Injuries to the obturator nerve can result in weakness or paralysis of the muscles of the inner thigh, while injuries to the obturator artery and vein can result in severe bleeding and require immediate medical attention.
Correct Answer is ["Tibia"]
Explanation
The tibia, also known as the shinbone, is the larger of the two bones in the lower leg.
It is a long bone that extends from the knee joint to the ankle joint, and it plays an important role in supporting body weight and providing attachment sites for muscles.
The tibia has a triangular cross-section and features several surface landmarks, including the tibial plateau, the medial malleolus, and the tibial tuberosity.
The bone is also involved in the formation of the knee joint and the ankle joint, where it articulates with the femur and the talus bones, respectively.
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