1. Objectives Compare mechanical digestion with chemical digestion.
Section 1 The Digestive System
Objectives
Compare mechanical digestion with chemical digestion.
Describe the parts and functions of the digestive system.

2. Digestive System at a Glance
Section 1 The Digestive System
Digestive System at a Glance
Your digestive system break down food so that it can be used by the body.
Food passes through the digestive tract. The digestive tract includes your mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, and anus.
The liver, gallbladder, pancreas, and salivary glands are also part of the digestive system.

3. Section 1 The Digestive System

4. Section 1 The Digestive System
Breaking Down Food
The breaking, crushing, and mashing of food is called mechanical digestion.
In chemical digestion, large molecules are broken down into nutrients with the aid of enzymes.

5. Objectives Describe the parts and functions of the urinary system.
Section 2 The Urinary System
Objectives
Describe the parts and functions of the urinary system.
Explain how the kidneys filter blood.
Describe three disorders of the urinary system.

6. Cleaning the Blood The Kidneys as Filters
Section 2 The Urinary System
Cleaning the Blood
The urinary system remove waste products from your blood.
The Kidneys as Filters
The kidneys are a pair of organs in the urinary system that clean the blood and excrete products as urine.

7. Section 2 The Urinary System

8. Urinary System Problems
Section 2 The Urinary System
Urinary System Problems
Bacterial Infections Bacteria can get into the bladder and ureters through the urethra and cause painful infections.
Kidney Stones Salts and other wastes can collect inside the kidneys and form kidney stones.
Kidney Disease Damage to nephrons can prevent normal kidney functioning and can lead to kidney disease.