When a normal heart is injected with physiological concentration of adrenalin, it shows

Which of the following is an emergency hormone

If $‘X’$ is a hormone which controls the carbohydrate metabolism in the body and $‘Y’$ is a hormone which controls  the secretion of $‘X’$, then $'X’$ and $‘Y’$ are

Norepinephrine

$(i)$ is released by sympathetic fibers

$(ii)$ is released by parasympathetic fibers

$(iii)$ increases the heart rate

$(iv)$ decreases blood pressure.

Which of the above statements are correct ?

The functioning of adrenal medulla gland is similar to those of nerves because