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Chemical Coordination and Integration · Question 52

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

Toxic agents present in food which interfere with thyroxine synthesis lead to the development of

  1. toxic goitre
  2. cretinism
  3. simple goitre
  4. thyrotoxicosis

Answer

(3) simple goitre

Solution

Substances in food that interfere with thyroxine synthesis (goitrogens) lower the level of thyroid hormones in blood, just like iodine deficiency.

⇒ Low thyroxine increases TSH secretion from the anterior pituitary, which causes enlargement of the thyroid gland.

⇒ As per NCERT, this hypothyroidism and enlargement of the thyroid gland is called goitre (simple goitre).

⇒ Toxic goitre and thyrotoxicosis are due to excess thyroxine; cretinism results from hypothyroidism during foetal life or infancy.

Answer: (3)

AIPMT 2010 (Prelims)

Keep practising — Chemical Coordination and Integration

2

Select the correct matching of a hormone, its source and function.

  1. array|l|l|l| Hormone & Source & Function \ Vasopressin & Posterior pituitary & Increases loss of \ & & water through urine \ array
  2. array|l|l|l| Hormone & Source & Function \ Norepinephrine & Adrenal medulla & Increases heart beat, \ & & rate of respiration and \ & & alertness \ array
  3. array|l|l|l| Hormone & Source & Function \ Glucagon & Beta-cells of Islets of & Stimulates glycogenolysis \ & Langerhans & \ array
  4. array|l|l|l| Hormone & Source & Function \ Prolactin & Posterior pituitary & Regulates growth \ & & of mammary glands \ & & and milk formation in \ & & females \ array
AIPMT 2010 (Prelims)
3

A health disorder that results from the deficiency of thyroxine in adults and characterised by (i) a low metabolic rate, (ii) increase in body weight and (iii) tendency to retain water in tissues is

  1. simple goitre
  2. myxoedema
  3. cretinism
  4. hypothyroidism.
AIPMT 2009
4

Which one of the following pairs of organs includes only the endocrine glands?

  1. Thymus and testes
  2. Adrenal and ovary
  3. Parathyroid and adrenal
  4. Pancreas and parathyroid
AIPMT 2008
5

The blood calcium level is lowered by the deficiency of

  1. both calcitonin and parathormone
  2. calcitonin
  3. parathormone
  4. thyroxine
AIPMT 2008
6

In human adult females oxytocin:

  1. causes strong uterine contractions during parturition
  2. stimulates pituitary to secrete vasopressin
  3. stimulates growth of mammary glands
  4. is secreted by anterior pituitary
AIPMT 2008
7

Feeling the tremors of an earthquake a scared resident of seventh floor of a multistoreyed building starts climbing down the stairs rapidly. Which hormone initiated this action?

  1. Adrenaline
  2. Glucagon
  3. Gastrin
  4. Thyroxine
AIPMT 2007
8

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. Parotid
  2. Pancreas
  3. Thyroid
  4. Parathyroid
AIPMT 2007
9

Compared to a bull a bullock is docile because of:

  1. Lower levels of adrenalin/noradrenalin in its blood
  2. Lower levels of blood testosterone
  3. Higher levels of thyroxin
  4. Higher levels of cortisone
Out of syllabusAIPMT 2007
10

Which hormone causes dilation of blood vessels, increased oxygen consumption and glucogenesis?

  1. Glucagon
  2. ACTH
  3. Insulin
  4. Adrenaline
AIPMT 2006
11

Which of the following is an accumulation and release center of neurohormones?

  1. Anterior pituitary lobe
  2. Posterior pituitary lobe
  3. Intermediate lobe of the pituitary
  4. Hypothalamus
AIPMT 2006

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