Science 8 REVIEWER

In the digestive system, there is a muscular organ that serves as a temporary storage area for food while also mixing it with digestive juices to begin breaking it down. Which organ performs this function?

• Liver

• Stomach

• Pancreas

• Gallbladder

As food moves through the digestive tract, it is pushed forward by a series of rhythmic, wave-like muscular contractions. What is the term used to describe this process?

• Peristalsis

• Segmentation

• Diffusion

• Osmosis

The large intestine has the primary task of absorbing a specific substance from the remaining undigested food. Which substance is it?

• Proteins

• Water

• Vitamins

• Fats

In the digestive process, food is first broken down into smaller pieces through physical means before any chemical digestion occurs. In which part of the digestive system does this mechanical digestion begin?

• Mouth

• Stomach

• Small intestine

• Large intestine

Saliva, which is produced in the mouth, contains an enzyme that begins breaking down a certain type of food molecule even before it reaches the stomach. Which type of food molecule is this?

• Proteins

• Carbohydrates

• Fats

• Vitamins

The stomach produces gastric juice, a mixture that contains hydrochloric acid and digestive enzymes. What is the main purpose of the hydrochloric acid in this mixture?

• To neutralize acids in food

• To kill harmful bacteria and activate enzymes

• To absorb nutrients

• To lubricate food

In the stomach, the enzyme pepsin is active and functions under acidic conditions. Which type of nutrient is pepsin specifically responsible for breaking down?

• Carbohydrates

• Proteins

• Fats

• Minerals

The pancreas is an important digestive organ that releases its enzymes into a specific part of the digestive system to continue breaking down food. Which part receives these enzymes?

• Stomach

• Small intestine

• Large intestine

• Esophagus

When you eat starchy foods such as bread or rice, digestion begins in the mouth. Which enzyme starts the process of breaking down the starch into simpler sugars?

• Amylase

• Protease

• Lipase

• Lactase

In a simple laboratory experiment, a sample of starch is mixed with saliva and allowed to sit for some time. What would most likely happen to the starch?

• It turns into sugar

• It solidifies

• It becomes fat

• It stays the same