Question

In the human body, the hormone which is secreted into the blood and which controls the rate of the heart beat is?
1. Adrenaline
2. Thyroxine
3. Insulin
4. Testosterone

Answer 1

Correct Answer - Option 1 : Adrenaline

The correct answer is Adrenaline.

 

• Adrenaline is secreted in response to stress of any kind and during emergency situations and is called emergency hormones or hormones of Fight Fright and Flight(Triple F hormone).
• Key actions of adrenaline include:-
  • Controlling the heart rate.
  • Increasing blood pressure.
  • Expanding the air passages of the lungs.
  • Enlarging the pupil in the eye. 
  • Redistributing blood to the muscles, and altering the body's metabolism, so as to maximize blood glucose levels (primarily for the brain).

 

• Thyroxine
  • Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland.
  • It plays a vital role in digestion, heart and muscle function, brain development, and the maintenance of bones.
• Insulin
  • ​Insulin is a peptide hormone and it regulates glucose homeostasis.
  • Insulin acts mainly on hepatocytes and adipocytes (cells of adipose tissue) and enhances cellular glucose uptake and utilization.
  • Insulin also stimulates the conversion of glucose to glycogen (glycogenesis) in the target cells.
• Testosterone
  • Testosterone is responsible for the development of male sexual characteristics.
  • Testosterone regulates fertility, muscle mass, fat distribution, and red blood cell production.