Question

_______ accelerates heart by stimulating adrenal medulla through the sympathetic nerve-
A. Adrenaline
B. Vasopressin
C. Thyroxine
D. Collip's hormone

Answer 1

Hint: Sympathetic nervous system is the main part of the autonomic nervous system along with the released adrenaline. Adrenaline, also called epinephrine, is a secreted form of the adrenal medulla in response to the stress conditions of the human body.

Complete answer:
Option - A- Adrenaline – Adrenaline in the human body is also known as epinephrine. It is a hormone as well as medication. Adrenaline is generally produced by both the adrenal glands along with a small number of neurons in the medulla oblongata, where it plays the role of a neurotransmitter involved in regulating visceral functions.
Option – B – Vasopressin Vasopressin is also known as antidiuretic hormone (ADH) as well as arginine vasopressin (AVP) is a nonapeptide synthesized in the hypothalamus. The biological study has explained its importance to play roles in the control of the body's osmotic balance, blood pressure regulation, sodium homeostasis, as well as for kidney functioning.
Option – C – Thyroxine- Thyroxine is considered to be the main hormone secreted into the bloodstream by the thyroid gland. It is an inactive form along with it thyroxine is converted to an active form called triiodothyronine by organs such as the liver and kidneys.
Option – D – Collips hormone- Parathormone or also known as parathyroid hormone is secreted by the chief cells of the parathyroid gland. This is also called Collip's hormone. This hormone in our body maintains calcium as well as phosphate balance between the tissues and blood.

The correct answer is option A- 'Adrenaline'.

Note:
Whenever homeostasis of the human body is disturbed, adrenaline is released which increases alertness, piloerection, along with rise in heart beat as well as strength of heart contraction. These reactions are considered as flight reactions induced by adrenaline.