Hormones as Chemical Messengers (WJEC GCSE Biology)

Hormones

• A hormone is a chemical substance produced by a gland and carried by the blood

• The hormone alters the activity of one or more specific target organs i.e. they are chemicals which transmit information from one part of the organism to another and bring about a change

• The glands that produce hormones in animals are known collectively as the endocrine system