In follicular cells of the thyroid gland lysosomes are essential for
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5%
iodination of thyroglobulin
5%
Synthesis of thyroglobulin
90%
hydrolysis of thyroglobulin into T3 + T4
0%
release of calcitonin
The colloid in thyroid follicles
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0%
is seen only by EM
0%
usually is basophilic
7%
contains calcitonin
93%
contains thyroglobulin
The main ultrastructural features of the thyroid follicular cell is presence of
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8%
rough and smooth endoplasmic reticulum
79%
rough endoplasmic reticulum and lysosomes
0%
few mitochondria
13%
basal secretory vesicles
Thyroid interfollicular cells secrete
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7%
parathyroid hormone
38%
thyroxin hormone
48%
calcitonin hormone
7%
calcium
lodine is essential for the synthesis of
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5%
parathormone
0%
calcitonin
95%
thyroxin
0%
cortisol
Normal parathyroid glands of adults possess
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76%
oxyphil cells
11%
chromaffin cells
0%
basophil cells
13%
parafollicular cells
Oxyphil cells of the parathyroid gland are characterized by
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78%
increase in number with age.
8%
rich in rER& Golgi apparatus.
8%
they represent degenerated chief cells
6%
secrete parathyroid hormone
👏1
Which is true about oxyphil cells
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92%
are deeply acidophilic
0%
contain numerous rER
5%
are more numerous than chief cells
3%
smaller than chief cells
Oxyphil cells are present in the
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98%
parathyroid gland
0%
adenohypophysis
0%
neurohypophysis
3%
pineal gland
Oxyphil cells of the parathyroid gland are acidophilic due to the presence of many:
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25%
sER
0%
rER
0%
lysosomes
75%
mitochondria
lodination of the thyroglobulin occurs:
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78%
extracellular in the follicular lumen
19%
intracellular inside the follicular cell
3%
ntercellular
0%
inside the capillaryi
The secretion of parathyroid cells is regulated by:
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5%
Thyroid stimulating hormone
95%
Blood calcium level.
0%
Corticosteroid level
0%
T3 & T4
Pinealocytes of the pineal body
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2%
produce melatonin only.
10%
are astrocyte-like cells
7%
are called brain sand
81%
produce serotonin & melatonin
Melatonin is secreted from
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7%
chromaffin cells
0%
astroglia cells
5%
corticotrophs
89%
pinealocytes
Pinealocytes
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0%
secrete melatonin only
0%
secrete serotonin only
5%
appear as brain sand
95%
secrete melatonin and serotonin
6. The most powerful mechanical force in the body caused by myofibroblasts is:
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11%
a) Granulation tissue
83%
b) Wound contraction
0%
c) Wound dehiscence
6%
d) Type IV cartilage