Human Digestive System Worksheet with labeled diagram and questions.

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 of the digestive system.

We are given a diagram with labeled parts (A–J), and we need to match them with the correct organ names:

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

Now, let’s identify each letter based on the typical human digestive system anatomy:

#### Analysis of Diagram:

- A: Located near the mouth, likely Salivary glands (since it's near the jaw).
- B: The organ just below the esophagus, which is the Stomach.
- C: The large organ above the stomach — this is the Liver.
- D: The long coiled tube — Small intestines.
- E: The lower end of the intestines, leading to the anus — Rectum.
- F: At the top of the head, opening for food — Mouth.
- G: Tube from mouth to stomach — Oesophagus.
- H: A small sac attached to the liver — Gall Bladder.
- I: Organ behind the stomach — Pancreas.
- J: The outer ring surrounding the small intestine — Large intestines.

#### ✔ Matching 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 |

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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 a passage; it's a flap that prevents choking. Also, liver is not part of the food path.

c. Mouth, oesophagus, stomach, small intestines, large intestines, anus
→ ✔ Correct! This is the actual path:
Mouth → Oesophagus → Stomach → Small Intestines → Large Intestines → Anus

d. Mouth, liver, gall bladder, stomach, large intestines, small intestines, anus
→ Incorrect. Liver and gall bladder are not in the direct pathway. Also, small intestines come before large intestines.

✔ 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?

Let’s evaluate:

a. Small intestines – Absorbs nutrients and some water, but not primarily for water absorption.

b. Large intestines – ✔ Main site for water absorption. It absorbs water from undigested food to form solid feces.

c. Kidneys – Part of urinary system; filter blood and produce urine. Not part of digestion.

d. Stomach – Mainly breaks down food and absorbs some substances, but not water.

✔ 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?

Let’s check:

a. Rectum – No HCl; stores feces.

b. Small intestines – Has enzymes, but no HCl. pH is alkaline.

c. Stomach – ✔ Produces hydrochloric acid (HCl) to digest food. It is lined with mucus to protect itself from the acid.

d. Oesophagus – No HCl; can be damaged by acid reflux, but does not produce it.

✔ Answer: c. Stomach

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✔ Final Answers:

(1) Matching 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 |

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

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