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 B
Explanation
The acromioclavicular joint is the articulation between the acromion of the scapula and the acromial end of the clavicle.
It is a plane synovial joint that allows movements of the shoulder girdle. Choice A is incorrect because the ulna and scapula do not form a joint.
The ulna is a bone of the forearm that articulates with the humerus and radius. Choice C is incorrect because none is not a valid option.
There is a specific joint between two bones that is called the acromioclavicular joint.
Choice D is incorrect because the humerus and scapula form a different joint, called the glenohumeral joint.
This is a ball-and-socket synovial joint that allows movements of the shoulder.
Correct Answer is D
Explanation
Bone marrow is the soft, spongy tissue that fills the medullary cavity of long bones.
Bone marrow contains hematopoietic stem cells that produce blood cells, as well as fat cells and other supportive cells.
Choice A is incorrect because spongy bone is not the tissue that fills the medullary cavity, but the type of bone tissue that surrounds it.
Spongy bone has a porous structure that provides strength and flexibility to the bone.
Choice B is incorrect because compact bone is not the tissue that fills the medullary cavity, but the type of bone tissue that forms the outer wall of the diaphysis.
Compact bone has a dense and hard structure that provides protection and support to the bone.
Choice C is incorrect because none of these is not a valid answer.
The medullary cavity of long bones does contain a specific type of tissue, which is bone marrow.
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