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  • Hormonally, heart rate is increased by  Option: 1 Noradrenaline  

Hormonally, heart rate is increased by

 

Option: 1

Noradrenaline

 


Option: 2

Thyroxine

 


Option: 3

Both a and b

 


Option: 4

Calcitonin

 


Answers (1)

best_answer
 

As we have learnt:

Hormonal regulation 

  • The medulla of adrenal glands secrete two hormones namely adrenaline and noradrenaline 
  • These two hormones tend to affect the heart rate
  • The function of noradrenaline is to increase the heart rate under normal conditions and that of adrenaline is to perform the same function during an emergency.
  • Noradrenaline and adrenaline can directly affect the SA Node 
  • Thyroxine also increases the oxidative metabolism of the cells. This requires more oxygen and thus heart rate increases.
  • Hormone thyroxine is secreted by thyroid gland

So,

Noradrenaline and adrenaline can directly affect the SA Node. Thyroxine also increases the oxidative metabolism of the cells. Hence, the correct answer is option c.

Posted by

himanshu.meshram

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