Steroid hormones are derived from . . . . . . .

In heart cells,which one serves as a second messenger speeding up muscle cell contraction in response to adrenaline?

Which of the following hormones is a polypeptide?

Match the following columns and select the correct option.

Column $I$	Column $II$
$(a)$ Pituitary hormone	$(i)$ Steroid
$(b)$ Epinephrine	$(ii)$ Neuropeptides
$(c)$ Endorphins	$(iii)$ Peptides,proteins
$(d)$ Cortisol	$(iv)$ Biogenic amines

Which of the following hormones bind with intracellular receptors?

Which of the following statements are applicable to hormones?
$I -$ Neural messengers
$II -$ Intercellular messengers
$III -$ Produced in trace amounts
$IV -$ Nutrient chemicals
$V -$ Released into the blood after production.