Lesson 3: Obtaining Energy and Removing Waste

Digestion

• is the mechanical breakdown of food into small particles

• is the mechanical and chemical breakdown f food into small particles and molecules that your body can absorb and use.

• is the chemical breakdown of food and molecules that your body can absorb and use.

What mechanical digestion means?

What is the process of photosynthesis?

(a)   Digestion is when chemical reactions breakdown pieces of food into small molecules.

Your salivary glands produce saliva at the thought of food. Saliva contains an enzyme that helps breakdown carbohydrates and contains substances that neutralize acidic foods.

• Mouth

• Esophagus

• Peristalsis

• Stomach

Muscular tube that connects the mouth to the stomach.

• Peristalsis

• Mouth

• Esophagus

• Stomach

Food moves through the esophagus and the rest of the digestive tract by waves of muscle contractions

• Mouth

• Esophagus

• Peristalsis

• Digestion

Acidic fluid called ________ ________

(a)  

Digestion starts in your (a)  

What stomach do?