Q1 of 39 Page 141

Mention if the following statements are true (T) or false (F). If false, rewrite the correct word (not words) striking out the single wrong one.

(i) The pituitary is of the size of a lemon. T/F


(ii) Pituitary has three lobes – anterior, posterior and intermediate. T/F


(iii) Over-secretion of growth hormone in adult causes gigantism. T/F


(iv) Vasopressin secreted by anterior lobe controls reabsorption of water form kidney tubules. T/F

(i) False


Explanation: Pituitary is of the size of a pea.


It is a small projection which hangs from the base of a mid-brain below hypothalamus.


(ii) False


Explanation: Pituitary has two distinct lobes anterior and posterior in humans.


The intermediate lobe of the pituitary gland is seen in some lower group animals but is absent in humans.


(iii) False


Explanation: Over-secretion of growth hormone in adult causes acromegaly.


Acromegaly is a condition where there is the extra growth of bones of jaws, hands, and feet. A person develops a large nose and thick lips.


(iv) False


Explanation: Vasopressin secreted by posterior lobe controls reabsorption of water from kidney tubules.


Deficiency of vasopressin causes diabetes insipidus.


More from this chapter

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6

Name the two categories of hormones secreted by the adrenal cortex.

(i) ____________________


(ii) ____________________

 1

Fill in the blanks with the correct alternative from those given for each:

(i) The thyroid is located close to ………………(larynx/kidney).


(ii) Cretinism is caused due to ……………….. of thyroxin (undersecretion/oversecretion)


(iii) Over-secretion of thyroxin causes ………………… goitre. (simple/exophthalmic)


(iv) The condition showing swelling of face and hands and sluggishness due to hypothyroidism is called …………………………… (cretinism/myxoedema)


(v) The hormone concerned with facing dangers is ……………………… (thyroxine/cortisone/adrenalin)


(vi) Cortex and medulla are the two regions of ……………………………………(thyroid/adrenal)


(vii) One of the effects of increased secretion of adrenaline is …………………………. (Dry mouth/slowing of heartbeat/face flushed with blood)

 2

Write the full forms of:

(i) TSH _____________


(ii) LH _____________


(iii) ACTH _____________


(iv) ADH _____________

 3

What causes the following?

(i) Acromegaly ………………………………………………


(ii) Diabetes insipidus ………………………………