The digestive system online activity - Free Printable

Let's solve the problem step by step.

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1. Label the digestive system parts

We are given a diagram of the human digestive system with blank labels (yellow boxes) pointing to different organs. We need to match each label from the list:

List of organs:
- Small intestine
- Large intestine
- Mouth
- Oesophagus
- Stomach
- Anus
- Liver
- Pancreas

Now, let’s identify where each part is located in the diagram based on standard anatomy:

#### From top to bottom (left side):
1. Mouth – The opening at the top where food enters.
2. Oesophagus – The tube going down from the mouth to the stomach.
3. Stomach – The J-shaped organ below the oesophagus.
4. Liver – Located above the stomach, on the right side (in the diagram, it’s shown as a red organ).
5. Pancreas – A long gland behind the stomach, often shown near the small intestine.
6. Small intestine – Coiled tube below the stomach and pancreas.
7. Large intestine – The wider tube surrounding the small intestine.
8. Anus – The opening at the end of the digestive tract.

But note: In the diagram, there are 8 yellow boxes — 4 on the left and 4 on the right.

Let’s assign them correctly based on the arrows:

#### Left-side labels (from top to bottom):
1. Mouth → Top left arrow pointing to mouth.
2. Oesophagus → Arrow pointing down from mouth to stomach.
3. Stomach → Arrow pointing to the red J-shaped organ.
4. Liver → Arrow pointing to the green organ (liver) on the upper right side of the stomach.

Wait — but the liver is on the right side, so likely the right-side labels include liver and pancreas.

Let’s re-analyze carefully:

Looking at the diagram:
- The mouth is labeled on the top left.
- The oesophagus is the tube going down from mouth to stomach.
- The stomach is the large red organ.
- The liver is shown as a green organ just above the stomach on the right side.
- The pancreas is a small organ behind the stomach, connected to the small intestine.
- The small intestine is the coiled yellow tube.
- The large intestine surrounds the small intestine.
- The anus is at the bottom.

So now, assigning the labels:

#### Left-side labels (top to bottom):
1. Mouth
2. Oesophagus
3. Stomach
4. Small intestine → The coiled yellow tube (but wait, this might be shared)

Wait — actually, the four left-side arrows point to:
- Mouth
- Oesophagus
- Stomach
- Then one pointing to the small intestine or large intestine?

But the four right-side arrows must be:
- Liver
- Pancreas
- Large intestine
- Anus

Let’s go step-by-step:

#### Correct labeling:

Left side (from top to bottom):
1. Mouth – top arrow to mouth
2. Oesophagus – arrow down to the tube
3. Stomach – arrow to the red organ
4. Small intestine – arrow to the coiled yellow structure (the main digestion site)

Right side (from top to bottom):
1. Liver – arrow to the green organ (on the right)
2. Pancreas – arrow to the small organ behind the stomach
3. Large intestine – arrow to the outer tube surrounding the small intestine
4. Anus – arrow to the bottom opening

✔ So final labeling:

| Left Side (Top to Bottom) | Right Side (Top to Bottom) |
|---------------------------|----------------------------|
| Mouth | Liver |
| Oesophagus | Pancreas |
| Stomach | Large intestine |
| Small intestine | Anus |

> Note: The large intestine is the outer tube around the small intestine. The anus is the exit point.

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2. Complete the sentences

We are to use the words:
Mouth, Oesophagus, Stomach, Liver, Pancreas, Small intestine, Large intestine, Anus

But only some will fit.

Let’s analyze each sentence:

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a) The ________ is a long tube that pushes the food into the stomach.
→ This describes the oesophagus.
✔ Answer: Oesophagus

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b) The ________ is where the digestive process starts.
→ Digestion begins in the mouth with chewing and saliva.
✔ Answer: Mouth

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c) The ________ is like a mixer and it breaks food down into very small pieces.
→ This refers to the stomach, which churns food.
✔ Answer: Stomach

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d) The ___________ produce juices that help to transform food into nutrients in the small intestine.
→ Both the liver (produces bile) and pancreas (produces pancreatic juice) help digest food in the small intestine.
But since it says "produce juices" (plural), and both contribute, we may need to include both.

However, the sentence uses singular "the" and blank. But looking at the word list, it’s likely expecting pancreas or liver, but both are correct.

But the pancreas produces enzymes that directly enter the small intestine, and the liver produces bile (stored in gallbladder) that helps digest fats.

But typically, the pancreas is most associated with producing digestive juices for the small intestine.

Alternatively, the sentence could be referring to liver and pancreas together, but since it's one blank, likely the intended answer is pancreas.

Wait — but the question says “produce” (plural verb), so it might expect liver and pancreas.

But the word list has individual organs. Let's see:

The sentence says:
"The ___________ produce juices..." → plural verb → needs a plural noun.

But all the options are singular.

So perhaps it's a mistake, or maybe they want liver and pancreas written together.

But since the options are single organs, and the sentence uses produce (plural), it's more likely that the expected answer is pancreas (even though it's singular), or perhaps the sentence should be "produces".

But let’s check the original:
"d) The ___________ produce juices..."

Yes, produce → plural.

So the best fit would be liver and pancreas, but that’s not in the list.

Alternatively, maybe the word is pancreas, and the verb is misused.

But in many educational contexts, this is accepted.

Alternatively, perhaps the intended answer is pancreas, even though the verb is plural.

But let's reconsider: the liver produces bile, and the pancreas produces pancreatic juice — both aid digestion in the small intestine.

But if only one blank, and we have to pick one, pancreas is the primary source of digestive enzymes.

But the liver also contributes.

Wait — perhaps the answer is liver and pancreas, but since it's not listed as an option, and the instruction says "with the words given", maybe it's acceptable to write both.

But the format suggests one word per blank.

Alternatively, maybe the sentence is meant to be:

"The liver and pancreas produce juices..."

But since we're limited to the given words, and the word list includes both, perhaps the intended answer is pancreas (most direct).

But let’s look at the next one.

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e) The ___________ separates the nutrients from the waste.
→ This is the large intestine. It absorbs water and forms feces, separating waste from useful substances.

Actually, small intestine absorbs nutrients, and large intestine absorbs water and forms waste.

So:
- Small intestine: absorbs nutrients
- Large intestine: absorbs water, compacts waste

So "separates the nutrients from the waste" — that’s a bit ambiguous.

But nutrients are absorbed in the small intestine, and waste is formed in the large intestine.

So the large intestine separates what’s useful (water) from solid waste.

But strictly speaking, small intestine is where nutrients are absorbed (so separates nutrients from undigested material), but large intestine deals with final waste.

But the best answer here is large intestine, because it processes the remaining material after nutrient absorption.

Wait — let’s clarify:

- Small intestine: absorbs most nutrients → separates nutrients from undigested matter.
- Large intestine: absorbs water and electrolytes, forming solid waste → separates water from waste.

But the phrase “separates the nutrients from the waste” — nutrients are already absorbed in the small intestine.

So perhaps the small intestine is the organ where nutrients are extracted from the food (i.e., separated from waste).

But “waste” here means indigestible material.

So both could be argued.

But standard teaching: small intestine absorbs nutrients; large intestine absorbs water.

So “separates nutrients from waste” — this happens mainly in the small intestine.

But then why would the large intestine be mentioned?

Let’s think again.

Actually, the small intestine is where most digestion and absorption occur — nutrients are absorbed into the blood, and undigested material goes to large intestine.

So the small intestine separates nutrients from waste (by absorbing nutrients).

Then the large intestine absorbs water from the waste.

So the best answer for e) is small intestine.

But earlier I thought large intestine.

Let’s double-check.

Wait — no: nutrients are absorbed in the small intestine, so it separates nutrients from waste.

Large intestine doesn’t absorb nutrients — it absorbs water and electrolytes.

So e) The small intestine separates the nutrients from the waste.

But the sentence says “separates the nutrients from the waste” — yes, that’s the small intestine.

But then what about d)?

Let’s go back.

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Re-evaluating:

d) The ___________ produce juices that help to transform food into nutrients in the small intestine.

This clearly refers to liver and pancreas.

- Liver produces bile → helps digest fats in small intestine.
- Pancreas produces digestive enzymes → break down proteins, carbs, fats in small intestine.

So both contribute.

But since the sentence uses produce (plural), and we need to fill one blank, perhaps the intended answer is pancreas, as it produces multiple enzymes.

But liver also produces bile.

Alternatively, maybe the answer is liver and pancreas, but that’s not a single word.

Given the word list, and the fact that pancreas is the main source of digestive enzymes, and liver supports via bile, but pancreas is the key.

But let’s see common textbook answers.

In many curricula, the pancreas is credited with producing digestive juices that enter the small intestine.

Similarly, liver is important.

But since the sentence says “produce” (plural), and only one blank, it’s likely a typo, and should be “produces”.

Assuming that, then pancreas is the best fit.

But let’s check online or standard knowledge.

Actually, both liver and pancreas produce secretions that aid digestion in the small intestine.

But since the blank is singular, and the word list has both, perhaps the expected answer is pancreas.

Alternatively, maybe the sentence is designed for liver, but liver doesn't produce enzymes — it produces bile.

But bile helps in fat digestion.

Still, the pancreas is more central.

But let’s look at e) again.

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e) The ___________ separates the nutrients from the waste.

This is tricky.

- Small intestine: absorbs nutrients → separates nutrients from waste (undigested material).
- Large intestine: absorbs water → concentrates waste, but doesn't separate nutrients (since nutrients are already absorbed).

So small intestine is the organ that separates nutrients from waste.

Thus, e) small intestine

But then d) — who produces juices?

Pancreas and liver both do.

But if we can only choose one, and the sentence uses “produce”, maybe it’s a mistake.

Perhaps the intended answer is pancreas.

Let’s assume that.

But let’s check standard answers.

After reviewing:

- a) Oesophagus
- b) Mouth
- c) Stomach
- d) Pancreas (or liver and pancreas, but likely pancreas)
- e) Small intestine

But wait — e): “separates the nutrients from the waste”

But the small intestine absorbs nutrients, so it separates them from the waste (which continues to large intestine).

Yes, that makes sense.

Large intestine does not absorb nutrients — it absorbs water.

So e) small intestine

But then what about d)?

Let’s try:

d) The pancreas produce juices... → grammar error — should be “produces”

But if we accept it, then pancreas

Alternatively, maybe the answer is liver and pancreas, but not allowed.

Another possibility: liver — because it produces bile, which helps in digestion.

But pancreas produces enzymes.

Both are valid.

But in many school-level texts, pancreas is emphasized.

Alternatively, the answer might be liver, but less likely.

Let’s look for clues.

Wait — in the diagram, the pancreas is shown near the small intestine, and ducts go into it.

So likely pancreas.

But let’s finalize.

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Final Answers:

#### 1. Labeling the diagram

Left side (top to bottom):
1. Mouth
2. Oesophagus
3. Stomach
4. Small intestine

Right side (top to bottom):
1. Liver
2. Pancreas
3. Large intestine
4. Anus

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#### 2. Complete the sentences

a) The oesophagus is a long tube that pushes the food into the stomach.
b) The mouth is where the digestive process starts.
c) The stomach is like a mixer and it breaks food down into very small pieces.
d) The pancreas produce juices that help to transform food into nutrients in the small intestine.
e) The small intestine separates the nutrients from the waste.

> Note: Sentence d) has a grammatical issue ("produce" vs. singular subject). If strict, it should be "The pancreas produces...", but in context, pancreas is the intended answer.

Alternatively, if the teacher accepts plural, liver and pancreas could be considered, but since it's not in the word list as a pair, pancreas is the best choice.

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✔ Final Answer Summary:

1. Labels:

- Left (top to bottom):
1. Mouth
2. Oesophagus
3. Stomach
4. Small intestine

- Right (top to bottom):
1. Liver
2. Pancreas
3. Large intestine
4. Anus

2. Sentences:

a) oesophagus
b) mouth
c) stomach
d) pancreas
e) small intestine

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Let me know if you'd like a printable version or explanation of each organ!