Digestive System Interactive Lesson

Digestive System Interactive Lesson

Explore the human digestive system through video, interactive activities, and 3D models. Test your knowledge with the matching game below.

1

Video Lesson

2

Interactive Activity

3

Anatomy Diagram

4

3D Model

5

Enhanced 3D Model

Section 1: Digestive System Video

Watch this educational video to understand the basic principles of the digestive system:

Learning Objectives:

Identify the main organs of the digestive system
Understand the process of digestion from ingestion to excretion
Learn the role of enzymes and digestive juices
Understand how nutrients are absorbed into the bloodstream

Section 2: Test Your Knowledge

Interactive Matching Game: Match the organs of the digestive system with their correct functions. Click on an organ first, then click on a function to make a match. Immediate feedback will be shown for each match.

Organs of the Digestive System:

1 Mouth

Click organ, then select function

2 Esophagus

Click organ, then select function

3 Stomach

Click organ, then select function

4 Small Intestine

Click organ, then select function

5 Large Intestine

Click organ, then select function

6 Liver

Click organ, then select function

7 Gallbladder

Click organ, then select function

8 Pancreas

Click organ, then select function

9 Rectum & Anus

Click organ, then select function

Functions (A–I):

A Produces bile to break down fats

B Stores bile and releases it into the small intestine

C Produces enzymes to break down food; also regulates blood sugar (endocrine function)

D Mechanical and chemical digestion begins here; saliva helps break down food

E Transports food from the mouth to the stomach

F Continues mechanical and chemical digestion; uses acid to break down proteins

G Main site of nutrient absorption into the bloodstream; lipids enter lymphatic system

H Absorbs water and electrolytes; forms feces

I Eliminates feces from the body

Answer Key (for self-check):

1 Mouth – D Mechanical and chemical digestion begins here; saliva helps break down food

2 Esophagus – E Transports food from the mouth to the stomach

3 Stomach – F Continues mechanical and chemical digestion; uses acid to break down proteins

4 Small Intestine – G Main site of nutrient absorption into the bloodstream; lipids enter lymphatic system

5 Large Intestine – H Absorbs water and electrolytes; forms feces

6 Liver – A Produces bile to break down fats

7 Gallbladder – B Stores bile and releases it into the small intestine

8 Pancreas – C Produces enzymes to break down food; also regulates blood sugar (endocrine function)

9 Rectum & Anus – I Eliminates feces from the body

Section 3: Digestive System Diagram

Click the button below to reveal a detailed diagram of the digestive system. Use the hint button if you need help identifying the organs.

Digestive System Diagram

Digestive System Hint

Section 4: Interactive 3D Model

Explore this interactive 3D model of the digestive system. You can rotate, zoom, and examine the organs from different angles.

The digestive system by FyndReality on Sketchfab

How to interact with the 3D model:

Left-click and drag to rotate the model
Scroll to zoom in and out
Right-click and drag to pan the view
Click the autospin button to stop/start automatic rotation

Section 5: Enhanced 3D Model with Organ Explorer

The Human Digestive System - 3D Model

This 3-D model presents the human digestive system. The model invites you to explore the digestive tract, a long and winding tube that begins at the mouth, includes the esophagus, duodenum, stomach, small intestine, large intestine (also known as the colon) and rectum, and ends at the anus. Various glands are attached to this tube (the liver and the pancreas) and to the mouth (saliva glands). Throughout the length of the tube, food undergoes mechanical and chemical breakdown.

Z

Zoom

You can enlarge or reduce the structures by using the mouse scrollbar.

R

Rotate

You can rotate the structures by clicking and holding the left mouse button while moving the cursor across the screen.

M

Move

To position the structures at different places on the screen, use the right mouse button.

Interactive 3D Model

Ready

Explore Organs

Click on an organ to learn about its function

M

Mouth

Start of digestion

E

Esophagus

Food transport tube

S

Stomach

Food storage & mixing

D

Duodenum

First part of SI

SI

Small Intestine

Nutrient absorption

LI

Large Intestine

Water absorption

L

Liver

Detoxification

P

Pancreas

Enzyme production

Mouth

Function: Mechanical breakdown of food through chewing and initial chemical digestion with saliva containing amylase enzyme.

Contains salivary glands that produce saliva
Breaks down carbohydrates with amylase
Forms food into a bolus for swallowing

Esophagus

Function: Muscular tube that transports food from the mouth to the stomach using peristaltic contractions.

Approximately 25 cm long in adults
Uses wave-like muscle contractions (peristalsis)
Contains sphincters to prevent backflow

Stomach

Function: J-shaped organ that stores food, mixes it with gastric juices, and breaks down proteins.

Can hold up to 1-1.5 liters of food
Secretes hydrochloric acid and pepsin
Mechanical churning creates chyme

Duodenum

Function: First part of the small intestine where most chemical digestion occurs.

Receives bile from liver and enzymes from pancreas
Neutralizes stomach acid with bicarbonate
About 25-30 cm long

Small Intestine

Function: Long, coiled tube where most nutrient absorption occurs through villi and microvilli.

Approximately 6-7 meters long
Contains millions of villi for absorption
Completes digestion of carbohydrates, proteins, and fats

Large Intestine (Colon)

Function: Absorbs water and electrolytes, and forms and stores feces.

About 1.5 meters long
Houses beneficial gut bacteria (microbiome)
Includes ascending, transverse, descending, and sigmoid colon

Liver

Function: Largest internal organ that produces bile, detoxifies substances, and stores nutrients.

Produces about 800-1000 mL of bile daily
Stores glycogen, vitamins, and minerals
Filters blood from digestive tract

Pancreas

Function: Produces digestive enzymes and hormones (insulin and glucagon) to regulate blood sugar.

Secretes pancreatic juice containing digestive enzymes
Produces bicarbonate to neutralize stomach acid
Endocrine function regulates blood glucose levels

Digestion Timeline

1

Mouth 0-30 seconds

2

Esophagus 5-10 seconds

3

Stomach 2-6 hours

4

Small Intestine 3-5 hours

5

Large Intestine 12-48 hours