Please explain all answers. 10. Which of the following is formed by intramembran
ID: 3512907 • Letter: P
Question
Please explain all answers.
10. Which of the following is formed by intramembranous ossification? Explain.
A) roof of the skull
B) carpal bones
C) femur
D)clavicle
E) the roof of the skull and the clavicle
Explannation:
13. In normal adults,
A) there is no turnover of minerals
B) a portion of the protein and mineral content is replaced each year
C) osteoblast activity exceeds osteoclast activity once bone has formed
D) osteoclasts continue to be active long after osteoblast activity ceases
Explannation:
14. The hormone calcitonin functions to
A) stimulate osteoclast activity
B) decrease the rate of calcium excretion
C) decrease the rate of calcium absorption
D) decrease the level of calcium ion in the blood
E) stimulate osteoblasts and inhibit osteoclasts
Explannation:
Explanation / Answer
10)E)roof of the skull and the clavicle
intramembranous bone formation involves differentiation of progenitor cells directly into osteoblasts and also involves formation of flat bones of the skull,mandible ,maxilla and the clavicles
hence only roof of the skull and mandible forms intramembranous ossification
13)B) portion of proteins and mineral content is replaced each year.
the bone remodelling process regulates the gain and loss of mineral and protein density in the adult skeleton and helps in regain of bone strength
14)D) decreases the level of calcium ions in the blood
it inhibits the activity of osteoclasts which are responsible for breaking down bone and increase the blood calcium level
it increases the rate of calcium absorption by the bones
it does'nt directly stimulate the activity of osteoblasts
hope the answers are clear to you!