Q. No.Toxic agents present in food which interfere with thyroxin synthesis lead to the development of:
1. toxic goitre
2. cretinism
3. simple goitre
4. thyrotoxicosis
A health disorder that results from the deficiency of thyroxin in adults and characterized by-
(i) a low metabolic rate
(ii) increase in body weight
(iii) tendency to retain water in tissues is:
1. hypothyroidism
2. simple goitre
3. myxoedema
4. cretinism
1. is secreted by anterior pituitary
2. stimulates growth of mammary glands
3. stimulates pituitary to secrete vasopressin
4. causes strong uterine contractions during parturition
1. parathormone
2. thyroxine
3. calcitonin
4. Both 1 and 3
1. Parathyroid and adrenal
2. Pancreas and parathyroid
3. Thymus and testes
4. Adrenal and ovary
Which one of the following is an example of a negative feedback loop in humans?
| 1. | Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold |
| 2. | Secretion of tears after falling of sand particles into the eye |
| 3. | Salivation of the mouth at the sight of delicious food |
| 4. | secretion of sweat glands and constriction of the skin blood vessels when it is too hot |
Feeling the tremors of an earthquake, a scared resident of the seventh floor of a multi-storey building starts climbing down the stairs rapidly. Which hormone initiated this act?
1. Thyroxine
2. Adrenaline
3. Glucagon
4. Gastrin
A person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly?
1. Parathyroid
2. Parotid
3. Pancreas
4. Thyroid
Compared to a bull, a bullock is docile because of:
1. higher levels of thyroxin
2. higher levels of cortisone
3. lower levels of blood testosterone
4. lower levels of adrenalin/noradrenalin in its blood
Which one of the following does not act as a neurotransmitter?
1. Acetylcholine
2. Epinephrine
3. Nor epinephrine
4. Cortisone
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