aa The skeletal system provides all of the following functions except a protecti
ID: 189793 • Letter: A
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aa The skeletal system provides all of the following functions except a protective enclosure of the viscera b production of red and white blood cells c thermoregulation d. calcium homeostasis e all of the above are functions of the skeletal system 4s. which of the following does NOT describe the metaphysis (growth plate) of a long bone? a. Contains fibrocartilage b. Has a zone in which there is hypertrophy of chondrocyte c. Has a zone in which there is proliferation (hyperplasia) of chondrocytes d. Is involved in interstitial (longitudinal) growth e. Two of these 46. The hormone that decreases absorption of calcium from the digestive tract and encourages the excretion of calcium in the urine is a. Calcitriol b. Calcitonin c. Vitamin A d. Parathyroid Hormone 47. Which of the following statements about fracture repair is false? a. b. c. d. e. Fibrocartilage is laid down to form a soft callus Osteoclastic activity does not occur during fracture repair A blood clot (hematoma) initially seals the broken area After the hard callous forms the bone continues to heal and be remodeled Two of these 48. -directly stimulates osteoblastic activity in bone a. Vitamin C b. Vitamin D c. Insulin-like growth factors d. Vitamin A The energy storage function of bone invoives a. Haversian canals b. Red marrow C. The periosteum d. Yellow marrow 49. 50. Which statement about bone tissue is false? a. Bone tissue has both organic and inorganic components b. After the epiphyseal plate seals bone can continue to grow interstitialy c. Bone tissue is important in maintaining the homeostasis of blood ion concentrations d. When osteoclastic activity outpaces osteoblastic activity bone tissue becomes brittle e. Two of these a. is promoted by smoking obesity, and low exercise levels b. Affects both genders equally c Weakens compact bone more than spongy bone d. Can be treated and slowed down e. Two of theseExplanation / Answer
44. option e is correct
as all the stated functions are related to the skeleton system
blood cells are produced in the bone marrow
the thermoregulation of the body temperature is done by the coordination of muscles and bone making us walk run shiver when it is too cold.
the skeleton provides protection to the organs
Finally, bone is made of calcium it plays an important role in calcium homeostasis
45. option c is correct
because metaphysis has the zone of hypertrophy is found not hyperplasia of chondrocytes
46. Option b is correct
as calcitonin is the hormone which is synthesized and secreted by parafollicular cells of the thyroid gland
which is secreted under the condition of hypercalcemia. Therefore, its work is to lower calcium level in blood so it increases the calcium loss in urine and decreases the absorption of calcium in the intestine.
47. option b is correct
as osteoclastic activity begin at the initial stage and increase at the time of bone healing according to research
48. Option b is correct
Vitamin D directly influence osteoblastic activity which is related to the development of bone. the deficiency of vitamin D causes Rickets and osteoporosis
49. Option D is correct
yellow bone marrow contains fat cells or adipose tissue which are related to the energy storage of body
50. Option b is correct
after the epiphyseal plate seals, the bone does not increase in length which is interstitial growth.
other statements are correct
bone matrix contains 40 % inorganic part (calcium hydroxyapatite )and 60 % organic part (90% collagen and rest other protein)
when break down of bone (osteoclastic activity) will outpass bone formation (osteoblastic activity) the bone will become weak and brittle.
bone tissue is important in maintaining calcium ion level
51. Option e is correct
it is true that smoking and low exercise level promotes osteoporosis. However, obesity was considered to be lower osteoporosis as obesity is related to increase in the bone mass. but according to the latest research have shown the effect of increased body weight to promote osteoporosis.
it can be treated and slowed down by intake of vitamin D
the false statements are osteoporosis effect more female than male
osteoporosis effect more the bone with the large spongy part.
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