Introduction to Reactions to the Internal and External Environment

Trouble brewing?

Trouble brewing? 2 choices…

Trouble brewing? 2 choices… OR

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

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

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”