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 ["Intercondylar eminence of the tibia"]
Explanation
The intercondylar eminence of the tibia is a prominent bony ridge located on the superior aspect of the tibial plateau, which is the top surface of the tibia bone that articulates with the femur.
The eminence separates the two condyles of the tibia and serves as an attachment site for several ligaments, including the anterior and posterior cruciate ligaments of the knee joint.
These ligaments play a critical role in stabilizing the knee joint and preventing excessive forward or backward movement of the tibia relative to the femur.
The intercondylar eminence also provides a surface for the menisci, which are C- shaped fibrocartilaginous structures that help absorb shock and distribute forces in the knee joint.
Correct Answer is D
Explanation
A cartilaginous joint is a joint where the bones are united by cartilage.
A hyaline cartilage joint is a type of cartilaginous joint where the bones are joined by hyaline cartilage.
An example of a hyaline cartilage joint is the first sternocostal joint that unites the first rib to the sternum.
Choice A is incorrect because hyaline cartilage joints are not present in the maxilla.
The maxilla is a single bone that forms the upper jaw and palate. Choice B is incorrect because none is not a valid answer.
Choice C is incorrect because fibrous cartilage joints are not present in the skull. The skull bones are joined by fibrous joints called sutures.
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