11) For intramembranous ossification to take place, which of the following is ne
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11) For intramembranous ossification to take place, which of the following is necessary B) A bone collar forms around the cartilage model. C) The cartilage matrix begins to deteriorate. D) An ossification center forms in the fibrous connective tissue 12) The process of bones increasing in width is known as A) epiphyseal plate closure C) appositional growth 12) B) dosing of the epiphyseal plate D) concentric growth 13) Bones are constantly undergoing resorption for various reasons. Which of the following cells13) A) osteoclast accomplishes this process? B) osteoblast C) stem cell D) osteocyte 14) Which hormone increases osteocdast activity to release more cakium ions into the bloodstream? 14) A) thyroxine C) estrogen B) parathyroid hormone D) calcitonin 15) 15) What is absolutely required for bone growth or healing from a fracture? A) osteoclasts C) osteocytes B) osteoblasts D) dietary intake of cakium and vitamin D 16- 16) Cartilage grows in two ways, appositional and interstitial, What is apositional growth? A) growth at the epiphyseal plate B) the lengthening of hyaline cartilage C) the secretion of new matrix against the external face of existing cartilage D) along the edges only of existing osteons, making each osteon larger 17) 17) Which of the following statements best describes interstitial growth? A) Fibroblasts give rise to chondrocytes that differentiate and form cartilage. B) Growth occurs in the lining of the long bones. C) Chondrocytes in the lacunae divide and secrete matrix, allowing the cartilage to grow from within. D) Unspecialized cells from mesenchyme develop into chondrocytes, which divide and form cartilage. 18 18) In the epiphyseal plate, cartilage grows A) in a circular fashion B) by pushing the epiphysis away from the diaphysis C) by pulling the diaphysis toward the epiphysis D) from the edges inward 19) B) lamellar bone D) osseous lamellae The structural unit of spongy is called- A) trabeculae ) osteonsExplanation / Answer
11.d.An ossification center forms in the fibrous connective tissue
12c.Appositional growth tis the growth of bones in the width
13a.Bone reabsorption is resorption of bone tissue, that is, the process by which osteoclasts break down the tissue in bones and release the minerals, resulting in a transfer of calcium from bone tissue to the blood.
14.b. High levels of calcium in the blood, on the other hand, leads to decreased PTH release from the parathyroid gland, decreasing the number and activity of osteoclasts, resulting in less bone resorption.
15d.Vitamin D and calcium both are required for the bone growth or for the healing fracture.
16.c.The process of appositional growth occurs when thecartilage model also grows in thickness due to the addition of more extracellular matrix on the peripheralcartilage surface, which is accompanied by new chondroblasts that develop from the perichondrium.
19a. The structural unit of spongy bone is called trabeculae.
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