Human Digestive System Worksheet | Download Free PDF | Human ... - Free Printable

Let's solve each part of this worksheet step by step.

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(1) Match the words provided to the letters in the diagram

We are given a diagram of the human digestive system with labeled letters A–J. We need to match each letter to the correct organ from the list:

Organs:
- Liver
- Stomach
- Salivary glands
- Pancreas
- Rectum
- Mouth
- Oesophagus
- Gall Bladder
- Small intestines
- Large intestines

Now, let’s analyze the diagram based on typical anatomy:

- A: This is near the mouth and jaw area — likely Salivary glands (since they are located near the mouth).
- B: This is the large sac-like organ just below the esophagus — this is the Stomach.
- C: Above the stomach, connected to it — this is the Liver.
- D: The coiled tube structure — this is the Small intestines.
- E: The final segment before the anus — this is the Rectum.
- F: At the top, opening of the digestive tract — this is the Mouth.
- G: Tube connecting mouth to stomach — this is the Oesophagus.
- H: Duct or small structure next to the stomach — this is the Gall Bladder (it sits under the liver and releases bile into the duodenum).
- I: Behind the stomach, secreting enzymes — this is the Pancreas.
- J: The larger, wider tube surrounding the small intestine — this is the Large intestines.

Let’s fill in the table:

| Letter | Part of Digestive System |
|--------|--------------------------|
| A | Salivary glands |
| B | Stomach |
| C | Liver |
| D | Small intestines |
| E | Rectum |
| F | Mouth |
| G | Oesophagus |
| H | Gall Bladder |
| I | Pancreas |
| J | Large intestines |

✔ Answer Key for Question 1:

| Letter | Part of Digestive System |
|--------|--------------------------|
| A | Salivary glands |
| B | Stomach |
| C | Liver |
| D | Small intestines |
| E | Rectum |
| F | Mouth |
| G | Oesophagus |
| H | Gall Bladder |
| I | Pancreas |
| J | Large intestines |

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(2) Which of the following gives the correct order for food as it passes through the organs of the digestive system?

Let’s go through each option:

a. Mouth, oesophagus, stomach, gall bladder, pancreas, large intestines, small intestines
✘ Incorrect — gall bladder and pancreas are accessory organs; food doesn’t pass *through* them. Also, small intestines come before large intestines.

b. Oesophagus, epiglottis, stomach, liver, small intestines, large intestines, anus
✘ Incorrect — epiglottis is not an organ food passes through; liver is not in the main path. Also starts at oesophagus, skipping mouth.

c. Mouth, oesophagus, stomach, small intestines, large intestines, anus
✔ Correct! This is the correct pathway:
- Food enters mouth → oesophagus → stomach → small intestines (for digestion & absorption) → large intestines (water absorption) → anus.

d. Mouth, liver, gall bladder, stomach, large intestines, small intestines, anus
✘ Incorrect — liver and gall bladder are not in the direct path; small intestines come before large intestines.

✔ Correct Answer: c. Mouth, oesophagus, stomach, small intestines, large intestines, anus

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(3) Which part of the digestive system is responsible for absorbing water?

Options:
a. Small intestines
b. Large intestines
c. Kidneys
d. Stomach

- Small intestines: Absorb nutrients and some water.
- Large intestines (colon): Main site for water absorption from undigested food.
- Kidneys: Part of urinary system, not digestive — filter blood and make urine.
- Stomach: Breaks down food, absorbs some alcohol and drugs, but not primarily for water.

✔ Correct Answer: b. Large intestines

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(4) Which part of the digestive system contains hydrochloric acid and is coated with mucus for its protection?

Options:
a. Rectum
b. Small intestines
c. Stomach
d. Oesophagus

- Hydrochloric acid (HCl) is secreted by the stomach (by parietal cells).
- The stomach lining is protected by mucus to prevent self-digestion by HCl and pepsin.
- Other parts don’t produce HCl.

✔ Correct Answer: c. Stomach

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✔ Final Answers:

(1) Table filled as above.

(2) c. Mouth, oesophagus, stomach, small intestines, large intestines, anus
(3) b. Large intestines
(4) c. Stomach

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