Chapter: 3 Movement in & out of Cells

12.3 Hormones

• So far in this chapter, we have seen how nerves can carry electrical impulses very quickly from one part of an animal’s body to another.
• Animals also use chemicals to transmit information from one part of the body to another.
• The chemical are called hormones.
• Hormones are made in special glands called endocrine glands.
• The hormones pass from the glad into the blood and are carried around the body in the blood plasma. Each hormone has particular organs that it affects, called its target organs.
• The hormone alter the activity of these target organs.

Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: [phone]

Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: [phone]