Body Systems

• The Circulatory System 40
• The Heart’s Work 42
• Heart Attack 44
• What Does Blood Consist of? 46
• The Lymphatic System 48
• The Respiratory System 50
• The Effects of Smoking 52
• The Hormonal System – Endocrine glands 54
• The Adrenal Gland 56
• The Thyroid Gland 58
• The Urinary System 60
• The Digestive System 62