calcium 23) Elevated levels of calcium ion in the blood stimalate the secretion
ID: 3518778 • Letter: C
Question
calcium 23) Elevated levels of calcium ion in the blood stimalate the secretion of the A) calcitonin B) thyroid hormone C) parathyroid hormone. D) growth hormone 24) 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. 25) Parathyroid hormone functions in all of the following ways except A) stimulating osteoclast activity B) increasing the rate of calcium absorption. C) decreasing the rate of calcium excretion. D) raising the level of calcium ion in the blood. E) inhibiting calcitonin secretion. 26) The adult skeleton contains major bones. A) 88 ?) 115 C) 174 D) 206 E) 251 27) The superficial membrane of a bone is called the A) endosteum B) ectosteum C) cortical membrane. D) periosteum. E) osteoid collar. 28) Each of the following structures is associated with the sphenoid bone except the A) foramen ovale. B) optic canals. C) pterygoid processes. D) sella turcica. E) cribriform plate. 29) The function of the hyoid bone is to A) stabilize the atlas and the axis. B) anchor the tongue muscles. C) protect the trachea.Explanation / Answer
23)
Calcitonin is the hormone secreted by thyroid glans in response to elevated calcium ions in the blood. This hormone exhibits opposite action to parathyroid hormone. Calcitonin regulates the calcium levels by reducing osteoclast activity in bones and reducing calcium reabsorption by kidneys. Option A is correct.
24) Calcitonin is a peptide hormone synthesized by parafollicular cells of thyroid gland. The function of calcitonin hormone is resuce calcium ion levels in blood. This is achieved by educing osteoclast activity in bones and reducing calcium reabsorption by kidneys. option D is correct.
25) Parathyroid hormone (PTH) is produced by parathyroid glands. This hormone has opposite action to calcitonin. PTH increases calcium levels and absorption to regulate blood calcium levels and reduce calcium excretion. PTH also stimulates the osteoclast activity. PTH cannot inhibit calcitonin secretion. Option E is correct.
26) The number of bones present in adults are 206. At the time of birth, number of bones are about 270. During growth and development some bones are fused. option D is correct.
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