A person on entering a darkroom finds a snake. Due to fear his body becomes stiff and the heart starts to beat fast. Which of the following is likely to happen to his hormonal control system as shown?

Secretion of adrenaline from part labelled Q

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Secretion of thyroxine from part labelled P

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Secretion of adrenaline from part labelled R

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Secretion of TSH from part labelled Q

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Solution

The correct option is B Secretion of adrenaline from part labelled R
Epinephrine, more commonly known as adrenaline, is a hormone secreted by the medulla of the adrenal glands (R). Strong emotions such as fear or anger cause epinephrine to be released into the bloodstream, which causes an increase in heart rate, muscle strength, blood pressure, and sugar metabolism.

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Similar questions

Dwarfism results due to :

(a) excessive secretion of thyroxine hormone

(b) excessive secretion of growth hormone

(d) less secretion of growth hormone

Which of the following statements regarding the given figure of the human brain is correct?

(i) Labelled part a is involved in the control of blood pressure, salivation and vomiting.
(ii) Labelled part b is responsible for the precision of voluntary actions and maintaining the posture and balance of the body.
(iii) The part labelled c is responsible for the change in the size of the pupil and activity like walking in a straight line.
(iv) The secretions part labelled d is responsible for the functioning of the hypothalamus.
(v) The part labelled e receives and integrates signals from the spinal cord.

Question 27
Dwarfism results due to:

(a) Excess secretion of thyroxin
(b) Less secretion of growth hormone
(c) Less secretion of adrenaline
(d) Excess secretion of growth hormone

Question 27
Dwarfism results due to:

(a) Excess secretion of thyroxin
(b) Less secretion of growth hormone
(c) Less secretion of adrenaline
(d) Excess secretion of growth hormone

Draw a labelled diagram showing reaborption and secretion fo major substances at different parts of the nephron.

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