21. Which of the following body cavities is not found in the ventral body cavity?a. Thoracicb. Cranial c. Abdominal d. Pelvic 2. Which of the following cells form ossification centres?a. Stem cellsb. Osteoblastc. Osteocyted. Osteoclast 3. Which of the following is FALSE?a. Wolff’s law states that bone grows and remodels in response to mechanical stressb. Appositional growth depends on the epiphyseal plate cartilagec. From years 0-20, osteoblast activity is generally greater than osteoclast activityd. Intramembranous ossification is not affected in achondroplastic dwarfism4. Bone remodelling is regulated by the hormone PTH which acts by …a. Regulating the release of sodium into the blood by stimulating osteoclast activity b. Regulating the release of calcium into the blood by stimulating osteoblast activity c. Regulating the release of calcium into the blood by stimulating stem cell activity d. Regulating the release of calcium into the blood by stimulating osteoclast activity 5. Which of the following bones is not ossified by endochondral ossification?a. Sternum b. Humerusc. Radiusd. Femu
Question
- Which of the following body cavities is not found in the ventral body cavity?a. Thoracicb. Cranial c. Abdominal d. Pelvic 2. Which of the following cells form ossification centres?a. Stem cellsb. Osteoblastc. Osteocyted. Osteoclast 3. Which of the following is FALSE?a. Wolff’s law states that bone grows and remodels in response to mechanical stressb. Appositional growth depends on the epiphyseal plate cartilagec. From years 0-20, osteoblast activity is generally greater than osteoclast activityd. Intramembranous ossification is not affected in achondroplastic dwarfism4. Bone remodelling is regulated by the hormone PTH which acts by …a. Regulating the release of sodium into the blood by stimulating osteoclast activity b. Regulating the release of calcium into the blood by stimulating osteoblast activity c. Regulating the release of calcium into the blood by stimulating stem cell activity d. Regulating the release of calcium into the blood by stimulating osteoclast activity 5. Which of the following bones is not ossified by endochondral ossification?a. Sternum b. Humerusc. Radiusd. Femu
Solution
Sure, here are the answers to your questions:
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The cranial cavity is not found in the ventral body cavity. So, the answer is b. Cranial.
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Ossification centers are formed by osteoblasts. So, the answer is b. Osteoblast.
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The statement that is false is b. Appositional growth depends on the epiphyseal plate cartilage. Appositional growth actually refers to the growth in width of a bone and it depends on the activity of the periosteum, not the epiphyseal plate cartilage.
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Bone remodeling is regulated by the hormone PTH which acts by regulating the release of calcium into the blood by stimulating osteoclast activity. So, the answer is d. Regulating the release of calcium into the blood by stimulating osteoclast activity.
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The sternum is not ossified by endochondral ossification. So, the answer is a. Sternum.
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