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Chemical Coordination and Integration · Question 72

AIPMT 2002MCQMedium📈 Topic in 25% papers+4−1
1

Adrenaline directly affects

  1. S.A. node
  2. -cells of Langerhans
  3. dorsal root of spinal nerve
  4. epithelial cells of stomach

Answer

(1) S.A. node

Solution

As per NCERT, adrenaline and noradrenaline (emergency hormones) increase alertness, pupillary dilation, piloerection, sweating, the heart beat, the strength of heart contraction and the rate of respiration.

∵ The heart beat is set by the pacemaker, adrenaline acts directly on the S.A. node and raises the heart rate.

∴ Adrenaline directly affects the S.A. node.

Answer: (1)

AIPMT 2002

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2

When both ovaries are removed from rat then which hormone is decreased in blood?

  1. Oxytocin
  2. Prolactin
  3. Estrogen
  4. Gonadotropin releasing factor
AIPMT 2002
3

Melatonin is secreted by

  1. pineal body
  2. skin
  3. pituitary gland
  4. thyroid
AIPMT 2000
4

MSH is secreted by

  1. anterior lobe of pituitary
  2. middle lobe of pituitary
  3. posterior lobe of pituitary
  4. endostyle
AIPMT 2000

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