Give an example of a hormone and a neurotransmitter.

Explanation

1) Endocrine glands secrete chemical substances called hormones directly into blood.
2) Hormones act on the cells of other organs and increase or decrease the metablism of carbohydrates, proteins and lipids.
3) The external features by which the males and females can be distinguished are called secondary sexual characters are responsible by the influence of hormones.
4) For example if a dog is after us, some changes we will observe on our body. When we are afraid, the rate of heart beat increases, the breath rate will be faster, blood pressure increases, the hair on the body becomes erect and we get goose bumps.
All these changes are by the release of adrenalin secreted by adrenal gland to bring back our body into normal.