---
title: What carries carbon dioxide from your toes back to your lungs? — The heart, blood and breathing · tree and pragmatics
description: What carries carbon dioxide from your toes back to your lungs? Test 6 · ★ of lesson 32 «The heart, blood and breathing» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Test 6 · ★ · The heart, blood and breathing

<!-- .ven lang=en -->
What carries carbon dioxide from your toes back to your lungs?

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **What happens:** carry · **To what, where:** carbon dioxide, toes

<!-- .vabout -->
This is test 6 · ★ of lesson 32 «The heart, blood and breathing» of the world course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/world/32-heart-blood-breathing/#t6).

## The question {#question}

```conllu
# sent_id = question:world:32-heart-blood-breathing:t6:1
# text = What carries carbon dioxide from your toes back to your lungs?
1	What	what	PRON	WP	PronType=Int	2	nsubj	_	_
2	carries	carry	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	carbon	carbon	NOUN	NN	Number=Sing	4	compound	_	_
4	dioxide	dioxide	NOUN	NN	Number=Sing	2	obj	_	_
5	from	from	ADP	IN	_	7	case	_	_
6	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	7	nmod:poss	_	_
7	toes	toe	NOUN	NNS	Number=Plur	2	obl	_	_
8	back	back	ADV	RB	_	2	advmod	_	_
9	to	to	ADP	IN	_	11	case	_	_
10	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	11	nmod:poss	_	_
11	lungs	lung	NOUN	NNS	Number=Plur	8	obl	_	SpaceAfter=No
12	?	?	PUNCT	.	_	2	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **carry** | present |  | carbon dioxide |  | your toes |  |  | vn carry-11.4 «NP V NP PP.initial\_location»: agent=Agent dioxide=Theme from toe=Initial\_Location |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
The air in the windpipe

```conllu
# sent_id = question:world:32-heart-blood-breathing:t6:o1:1
# text = The air in the windpipe
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	air	air	NOUN	NN	Number=Sing	0	root	_	_
3	in	in	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	windpipe	windpipe	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 {#o2}

<!-- .ven lang=en -->
The food in the gut

```conllu
# sent_id = question:world:32-heart-blood-breathing:t6:o2:1
# text = The food in the gut
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	food	food	NOUN	NN	Number=Sing	0	root	_	_
3	in	in	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	gut	gut	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 3 · ← Mova's choice · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The blood in the veins

```conllu
# sent_id = question:world:32-heart-blood-breathing:t6:o3:1
# text = The blood in the veins
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	blood	blood	NOUN	NN	Number=Sing	0	root	_	_
3	in	in	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	veins	vein	NOUN	NNS	Number=Plur	2	nmod	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
The nerves in the leg

```conllu
# sent_id = question:world:32-heart-blood-breathing:t6:o4:1
# text = The nerves in the leg
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	nerves	nerve	NOUN	NNS	Number=Plur	0	root	_	_
3	in	in	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	leg	leg	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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