1. Introduction to Reactions to the Internal and External Environment

2. Trouble brewing?

3. Trouble brewing? 2 choices…

4. Trouble brewing? 2 choices…OR

5. Two systems coordinate communication throughout the body
The endocrine system secretes hormones that coordinate slower but longer-acting responses including reproduction, development, energy metabolism, growth, and behaviour
The nervous system conveys high-speed electrical signals along specialized cells called neurons; these signals regulate other cells

6. What signals caused this butterfly to grow within the body of a caterpillar?

7. Your Body’s Communication Systems
22/05/2019
Basically, your body communicates with itself in two ways; using hormones and using a nervous system.
Facts about hormones
They are chemicals
They’re relatively slow
They last a long time
Facts about nerve impulses
They are electrical signals
They are quick
They last a short time
The human body regulates things like temperature and water levels using both of these systems. This is called “homeostasis”