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Chemical Coordination and Integration · Question 56

AIPMT 2008MCQEasy📈 Topic in 25% papers+4−1
1

The blood calcium level is lowered by the deficiency of

  1. both calcitonin and parathormone
  2. calcitonin
  3. parathormone
  4. thyroxine

Answer

(3) parathormone

Solution

As per NCERT, parathyroid hormone (PTH) increases the Ca2+ level in the blood: it stimulates demineralisation (bone resorption), and reabsorption of Ca2+ by the renal tubules and its absorption from digested food.

⇒ PTH is a hypercalcaemic hormone, while thyrocalcitonin (TCT) lowers blood calcium.

∴ Deficiency of parathormone lowers the blood calcium level (hypocalcaemia, tetany).

Answer: (3)

AIPMT 2008

Keep practising — Chemical Coordination and Integration

2

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
3

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
4

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
5

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
6

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

  1. Glucagon
  2. ACTH
  3. Insulin
  4. Adrenaline
AIPMT 2006
7

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
8

A steroid hormone which regulates glucose metabolism is

  1. cortisone
  2. cortisol
  3. corticosterone
  4. 11-deoxycorticosterone.
AIPMT 2006
9

Which one of the following is not a secondary messenger in hormone action?

  1. cAMP
  2. cGMP
  3. Calcium
  4. Sodium
AIPMT 2006
10

Which one of the following statements is correct?

  1. Endocrine glands regulate neural activity, but not vice versa.
  2. Neurons regulate endocrine activity, but not vice versa.
  3. Endocrine glands regulate neural activity, and nervous system regulates endocrine glands.
  4. Neither hormones control neural activity nor the neurons control endocrine activity.
AIPMT 2006
11

Which one of the following hormones is modified amino acid?

  1. Epinephrine
  2. Progesterone
  3. Prostaglandin
  4. Estrogen
AIPMT 2004

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