Science · Grade 5

Active learning ideas

The Journey of Food: Digestion

Active learning helps students grasp the digestive system's complexity because it connects abstract processes to tangible experiences. When students build models or simulate movements, they internalize the sequence and functions of each organ in a way that reading alone cannot achieve.

• Ontario Curriculum Expectations
• 4-LS1-1

• 30–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Simulation Game
• 45 min · Small Groups

Model Building: Edible Digestive System

Provide crackers, ziplock bags for stomach, pantyhose for intestines, and water. Students chew crackers, simulate stomach churning, squeeze through pantyhose to show absorption, and form waste. Discuss observations in groups.

Analyze how different organs in the digestive system work together to break down food.

Facilitation Tip

During the Edible Digestive System activity, have students use licorice for the esophagus and banana slices for the stomach lining to make the model both accurate and memorable.

What to look for

Provide students with a diagram of the digestive system with blank labels. Ask them to label at least five key organs and write one sentence describing the main function of each labeled organ.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 02

• Simulation Game
• 30 min · Whole Class

Peristalsis Relay: Food Journey Race

Form lines where students pass a balled-up bread piece mouth-to-anus using body waves to mimic peristalsis. Time each group, then debrief on smooth muscle role and challenges of coordination.

Explain the importance of nutrient absorption in the small intestine.

Facilitation Tip

In the Peristalsis Relay, demonstrate the motion with a long sock filled with soft balls to show how muscles work together to move food.

What to look for

Pose the question: 'Imagine your small intestine suddenly stopped absorbing nutrients. What would be the immediate and long-term effects on your body?' Facilitate a class discussion where students share their predictions and reasoning.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Simulation Game
• 40 min · Pairs

Villi Simulation: Nutrient Absorption Stations

At stations, use sponges as villi to absorb colored water from 'food' trays. Students measure absorption rates, compare surface area effects, and link to small intestine efficiency.

Predict what would happen if one organ in the digestive system stopped functioning.

Facilitation Tip

For the Villi Simulation, use sponges cut into tiny finger-like projections to represent villi and have students dip them into colored water to observe absorption.

What to look for

On an index card, have students draw a simple flowchart showing the path of a bite of food through the digestive system. They should include at least three organs and a brief description of what happens to the food in each.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 04

• Simulation Game
• 35 min · Small Groups

Disruption Scenarios: What If? Debates

Assign groups an organ failure scenario, like no stomach acid. Groups predict body impacts using flowcharts, present findings, and vote on most critical organ.

Analyze how different organs in the digestive system work together to break down food.

Facilitation Tip

During Disruption Scenarios, provide real-world examples like lactose intolerance or celiac disease to ground the debates in students' prior knowledge.

What to look for

Provide students with a diagram of the digestive system with blank labels. Ask them to label at least five key organs and write one sentence describing the main function of each labeled organ.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

A few notes on teaching this unit

Experienced teachers know that starting with a hands-on model builds engagement before introducing terminology. Avoid overwhelming students with enzyme names too early; focus first on the sequence of organs and their basic functions. Research shows that students retain more when they can physically manipulate materials and discuss their observations in small groups.

Students will demonstrate understanding by accurately describing the role of each organ in digestion and explaining the difference between mechanical and chemical digestion. They should also recognize that nutrient absorption occurs primarily in the small intestine, not the stomach or large intestine.

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Watch Out for These Misconceptions

• During the Edible Digestive System activity, watch for students who place nutrient absorption in the stomach or mouth. Redirect their attention to the small intestine model and ask them to explain why its structure (villi) makes it the primary site for absorption.

  After the Villi Simulation, have students compare the surface area of their sponge villi to the flat stomach lining. Ask them to explain how surface area affects absorption speed and efficiency.

• During the Villi Simulation activity, watch for students who assume the large intestine absorbs nutrients. Redirect their discussion by asking them to measure the amount of colored water absorbed by the sponge villi compared to the filter paper representing the large intestine.

  After the Edible Digestive System activity, ask students to trace the path of their 'food' through the model and describe where water is reabsorbed, clarifying the large intestine's role.

• During the tasting experiments in the Edible Digestive System activity, watch for students who believe all foods digest at the same rate. Have them time how long it takes for a cracker to dissolve compared to a piece of fruit, and discuss why enzymes like amylase target starches differently.

  During the Peristalsis Relay, ask students to predict which 'food' (soft ball vs. crumpled paper) will move through the esophagus model fastest, then test their predictions to reinforce the idea that food texture affects digestion speed.

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Methods used in this brief

• Simulation Game