Unit 2 Test Review

Which of the following is evidence of a chemical reaction?

• Change in size

• Change in shape

• Bubbles being released, and a color change

• Change in form or state of matter

What is digestion?

• Storing food in the stomach
• Breaking down food to release energy
• Control all activities in the body
• Relaying electrical messages throughout the body

Mechanical digestion

• Breaking down food for fun
• Breaking down food physically
• Breaking down food chemically
• Breaking down food because I said so

Chemical digestion

• Breaking down food because its the right thing to do
• Breaking down food mechanically
• Breaking down food with chemicals
• Breaking down food after you finish your homework

Where does digestion start?

• Esophagus
• Trachea
• Mouth
• Stomach

What different chemicals are pumped into the small intestine?

• Saliva
• Hydrochloric Acid
• Bile and Enzymes
• Mucus

How does the mouth break up food mechanically?

• Saliva softens food
• Peristalsis pushes food down into the stomach
• Teeth and tongue physically break down the food

What softens the food in the mouth resulting in chemical digestion?

• Teeth
• Tongue
• Saliva
• Mucus

Saliva is an example of what type of digestion?

• Chemical 
• Mechanical

Where does the food travel after the stomach?

• Esophagus
• Mouth
• Anus
• Small Intestine