1. The endocrine system
All the glands in the body that produce hormones (see diagram for examples)
From:

2. The importance of the endocrine system:
No cell in the body operates alone-- function depends on hormonal chemical control
A small amount of hormone can make a BIG impact

3. What is a hormone?
A chemical released by one cell that affect cells in other body parts by speeding up or slowing down bodily processes
From:
From:

4. Examples of hormones and what they do:
Testosterone: secondary sex characteristics such as facial hair, muscle development, deep voice
Estrogen: secondary sex characteristics such as breast development and larger hips
Thyroid hormone: regulates rate of breakdown of food molecules to provide energy
Adrenalin: helps organism respond to immediately stressful situations