True or false regarding thyroid hormone?

True or false regarding thyroid hormone?

a. In the circulation , thyroxin is transported bound to thyroglobulin
b. I - trapping by thyroid cells does need energy
c. I - is oxidized prior to iodination of thyrosine
d. Thyroid peroxidase inhibitors are used in the treatment of hyperthyroidism
e. Low thyroxin level result in deafness


Answer

a. F
b. F
c. T
d. T
e. T


True or false regarding calcium ?

a. Rise in the plasma pH cause a fall in the plasma ionized calcium
b. Dihydroxycholecalciferol increase calcium absorption in the small intestine
c. Calcium reabsorption in the proximal tubule is increased by parathhormone
d. Calcitonin reduces total levels circulating calcium
e. Reduced free calcium levels cause tetany in cardiac muscle


Answer
a. T
b. T
c. T
d. F
e. F


prolactin ( T / F )

a. Stimulate milk ejection
b. Is produced by the acidophilic cells of the anterior pituitary
c. Secretion is inhibited by thyrotropin releasing hormone
d. Levels are increased when a dopamine agonist is given
e. Level when increased causes amenorrhoea


Answer
a. F
b. T
c. T
d. F
e. F


Male Infertility is compatible with

a. sperm count of 100 million / ml
b. abnormal sperm percentage of 30 %
c. Non-mortile sperm percentage of 60 %
d. lack of nitric oxide release during coitus
e.absence of Barr bodies in the buccal mucosa

Answer

a.F
b.T
c.T
d.T
e.F


Features of Graves disease include(s)

a.Hyperphagia
b.Heat intolerance
c.Polydypsia
d.Fine tremors of finger
e.Potrusion of the eyeballs


Answer

a. T
b. T
c. F
d.T
e.T


On which of the following tissue do (es) thyroid hormones have a catabolic effect?

a. Muscle
b. Adipose tissue
c. Bone
d. Heart
e. Small intestine


Answer

a.T
b.T
c.F
d.F
e.F


True or False
a. Testosterone is secreted by Leydig cells
b. Leydig cells play an important role in the formation of the blood testis barrier
c. Testosterone
d. Sertoli Cells provide nutrition to germ cells
e. Spermatogenesis take ten days for completion


Answer
a. T 
b. F 
c. T 
d. T 
e. F

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