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 ["The olecranon fossa"]
Explanation
The olecranon fossa is a depression located on the posterior aspect of the distal end of the humerus bone, just above the trochlea.
It is part of the elbow joint and serves as a resting place for the olecranon process of the ulna bone during elbow extension.
The fossa is bordered by the medial and lateral epicondyles of the humerus and is separated from the trochlea by a thin medial ridge.
The olecranon fossa is an important landmark for orthopedic surgeons as it provides access to the distal humerus for surgical procedures, such as total elbow replacement.
Injury to the olecranon fossa can result in fractures or dislocations of the elbow joint.
Correct Answer is ["Posterior sacral foramina"]
Explanation
The posterior sacral foramina are openings located on the posterior aspect of the sacrum bone, which is part of the pelvis.
They are paired structures that allow the sacral nerves and blood vessels to pass through and exit the sacrum.
There are typically four pairs of posterior sacral foramina, located at the lateral margins of the sacrum.
These foramina are important for the transmission of nerve signals and blood supply to the lower limbs and pelvic organs.
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