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Gene Mutation

State the eff...

Question

State the effects of oversecretion of the following: [3 MARKS]
(a) Thyroxine
(b) Parathormone
(c) Somatotropin

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Solution

Each Part: 1 Mark

(a) The oversecretion of thyroxine causes exophthalmic goitre.

(b) The oversecretion of parathormone causes demineralization of bones.

(c) The oversecretion of somatotropin causes gigantism in children and acromegaly in adults.

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Q. Fill in the blanks with the correct alternative from those given for each: [5 MARKS]
(i) Thyroid is located close to ___. (larynx/kidney)
(ii) Cretinism is caused due to ___ of thyroxine. (undersecretion / oversecretion)
(iii) Oversecretion of thyroxine causes ___ goitre. (simple / exophthalmic)
(iv) The condition showing swelling on face and hands and sluggishness due to hypothyroidism is called ___. (cretinism / myxoedema)
(v) The hormone concerned with facing dangers is ___. (thyroxine / cortisone / adrenaline)

Q. Oversecretion of thyroxin causes .......... goiter. (simple/ exophthalmic)

Match the conditions in column A with the cause in column B

A (Condition) B (Cause)

(a) Dwarfism and mental retardation (i) Excess of glucose in blood.

(b) Diabetes mellitus (ii) Over secretion of growth hormone.

(c) Shortage of glucose in blood (iii) Insulin shock.

(d) Gigantism (iv) Over secretion of thyroxine.

(e) Enlargement of breasts in adult males (v) Hypothyroidism in a child.

(f) Exophthalmic goiter (vi) Over secretion of cortical hormones.

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

Q. Match the list I with list II and choose the correct answer.
List I List II
A. Adenohypophysis (1) Epinephrine
B. Adrenal medulla (2) Somatotropin
C Parathyroid gland (3) Thymosin
D Thymus gland (4) Parathormone

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