Question

Hormone with no effect on heart beat is

• A. Oxytocin
• B. Adrenaline
• C. Noradrenaline
• D. Thyroxine

Answer 1

The correct option is A Oxytocin

Oxytocin is a peptide hormone secreted from posterior lobe of pituitary gland i.e. neurohypophysis. It induces strong uterine contractions during parturition.

Adrenaline and noradrenaline are the catecholamines secreted from adrenal medulla in response to stress conditions in the body or when homeostasis of body is disturbed. They induce fight or flight reactions in the body which increase alertness, heart beat and strength of heart contraction.

Thyroid affects heart beat as low levels of thyroxine slow down heartbeat.

So, the correct answer is 'Oxytocin'.