What is a hormone?

A hormone is a chemical messenger. It is produced by a gland and then travels in the blood to a specific target organ where it causes a response, changing the way the body functions. Hormones can be protein based (such as adrenaline) or steroid based (such as testosterone).

Answered by Emily A. Biology tutor

8654 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

a) What is the function of the atrioventricular valves? b) When the ventricles are contracting, are the arterioventricular valves open or closed? c) Explain why the muscle walls of the atria are thinner than the walls of the ventricles.


Why does a mutation in the genetic code change the structure of a haemoglobin molecule?


Each skin cell in a mouse has 40 chromosomes. How many chromosomes were present in each cell after dividing four times during cell culture?


Describe how a sperm cell is adapted to its role (4 marks).


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences