The skeleton and muscles

Tests: 8 of 13 right · Exam: 2 of 4 right · Kind: plain · Understood: 8 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 31 of the world course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.

Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.

Test 1 · wrong ✗

You straighten your arm to reach a book on a shelf. Which muscle is pulling?

1. No muscle, the arm falls straight — score 8
2. The biceps, by pushing — score 8
3. The triceps at the back of the arm — ✓ the right answer · score 4
4. The biceps at the front of the arm — ← Mova's choice · score 12

Why: It took the question to ask who or what does it. It chose option 4 with score 12, against 8 for the next best. Its support: lesson 31, line 5: «Muscles move the bones. A muscle can only pull, never push, so muscles work in pairs: when you bend your arm the biceps at the front pulls, and to straighten i…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same doer «biceps» (+4); the same action «pull» (+3). The right option, 3, scored 4. · the question and its options parsed, with trees and pragmatics

Test 2 · wrong ✗

A cyclist wears a helmet. Which bone is the helmet helping to protect?

1. The backbone, which guards the heart — score 9
2. The ribs, which guard the lungs — ← Mova's choice · score 14
3. The thigh bone, which holds blood — no support
4. The skull, which guards the brain — ✓ the right answer · score 9

Why: It took the question to ask who or what does it. It chose option 2 with score 14, against 9 for the next best. Its support: lesson 31, line 2: «The skeleton holds you up, gives your body its shape and protects soft parts: the skull guards the brain and the ribs guard the heart and lungs.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same doer «ribs» (+4); the same action «guard» (+3); the same thing acted on «heart» (+2). The right option, 4, scored 9. · the question and its options parsed, with trees and pragmatics

Test 3 · wrong ✗

Which is true?

1. Bones move by themselves without muscles — ← Mova's choice · no support
2. Muscles work in pairs because each can only pull — ✓ the right answer · no support
3. One muscle both bends and straightens a joint — no support
4. Muscles push bones to straighten them — no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 4 · right ✓

What would happen if we had no joints at all?

1. We could not bend our arms, legs or back — ← Mova's choice · ✓ the right answer · no support
2. Nothing, joints are only for decoration — no support
3. We would bend more easily — no support
4. Our muscles would become stronger — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 5 · right ✓

A girl broke her wrist, and after some weeks in a cast it was whole again. Why?

1. The muscle took over the job of the bone — no support
2. The cast glued the bone together — no support
3. Living bone grew and joined the break — ← Mova's choice · ✓ the right answer · score 5
4. A new bone grew in another place — score 5

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 31, line 3: «Bones are alive: they grow, they mend when they break, and inside many of them soft marrow makes new blood cells.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «bones» (+3); the same action «grow» (+2). · the question and its options parsed, with trees and pragmatics

Test 6 · right ✓

Which of these is a joint?

1. The knee — ← Mova's choice · ✓ the right answer · no support
2. The biceps — no support
3. The skull — no support
4. The thigh bone — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

Which statement about the heart is true?

1. It is a joint between the lungs — ← Mova's choice · no support
2. It only works when we tell it to and think about it — no support
3. It is a bone inside the ribs — no support
4. It is a muscle that works without us thinking — ✓ the right answer · no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 8 · wrong ✗

Granny is told to eat more yoghurt and cheese. What are these foods mostly helping?

1. Her hair, by making it curly — ← Mova's choice · no support
2. Her bones, by giving them calcium — ✓ the right answer · no support
3. Her eyes, by giving them light — no support
4. Her lungs, by giving them air — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 9 · right ✓

What does the spinal cord have around it for protection?

1. The bones of the backbone — ← Mova's choice · ✓ the right answer · no support
2. The two long thigh bones of the legs — no support
3. The hard bones of the skull — no support
4. The curved ribs of the chest — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 10 · right ✓

wait how come u can bend ur knee but not ur shin in the middle

1. The shin bone is too short to bend — no support
2. The knee is a joint where two bones meet; the shin has no joint in its middle — ← Mova's choice · ✓ the right answer · score 8
3. Muscles in the shin push it straight — score 5
4. The knee has no bones inside it — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 8, against 5 for the next best. Its support: lesson 31, line 4: «Where two bones meet there is a joint, such as the knee, the elbow or the shoulder, which lets the body bend and turn.», reached through the same lesson line as the sentence the question matched. What matched: the same action «meet» (+4); the same doer «two bones» (+4). · the question and its options parsed, with trees and pragmatics

Test 11 · right ✓

my arm muscle pulls it bent, so what straightens it back, does it just push?

1. The bone springs back by itself — no support
2. The elbow joint pushes it straight — no support
3. The biceps pushes the arm back straight — score 8
4. Another muscle at the back, the triceps, pulls it straight — ← Mova's choice · ✓ the right answer · score 9

Why: It took the question to ask who or what does it. It chose option 4 with score 9, against 8 for the next best. Its support: lesson 31, line 5: «Muscles move the bones. A muscle can only pull, never push, so muscles work in pairs: when you bend your arm the biceps at the front pulls, and to straighten i…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same action «pull» (+3); the same doer «muscle» (+2). · the question and its options parsed, with trees and pragmatics

Test 12 · right ✓

Leo says bones are dead, like rocks inside you. true?

1. Yes, bones are dead and only hold you up — no support
2. No, bones are alive: they grow, mend and make blood cells — ← Mova's choice · ✓ the right answer · score 6
3. No, bones are made of muscle that has hardened — score 2
4. Yes, but they come alive when they break — score 6

Why: It took the question to ask which statement is true. It chose option 2 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 31, line 3: «Bones are alive: they grow, they mend when they break, and inside many of them soft marrow makes new blood cells.», reached through the remembered sentence the question matched. What matched: the same action «grow» (+4); the same doer «bones» (+2). · the question and its options parsed, with trees and pragmatics

Test 13 · right ✓

my big sis reckons a baby has fewer bones than us cos it's tiny. right?

1. Yes, a baby has no bones until it can walk — no support
2. No, a baby has exactly 206 like an adult — no support
3. Yes, a baby has about 100 and grows more — score 6
4. No, a baby has about 300 and some join together later — ← Mova's choice · ✓ the right answer · score 7

Why: It took the question to ask which statement is true. It chose option 4 with score 7, against 6 for the next best. Its support: lesson 31, line 8: «A baby is born with about 300 bones, and some of them join together as it grows.», reached through a sentence linked to the one the question matched. What matched: the same action «join» (+3); the same doer «some» (+2); the same property (+2). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

State the number of bones in the skeleton of an adult human being.

1. Two hundred and sixty — ← Mova's choice · no support
2. Three hundred — no support
3. Two hundred and six — ✓ the right answer · no support
4. One hundred and six — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

Identify the organs protected by the ribs.

1. The heart and the lungs — ← Mova's choice · ✓ the right answer · no support
2. The kidneys and the liver — no support
3. The stomach and the intestines — no support
4. The brain and the eyes — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

Which of the following statements most accurately characterises the action of a muscle?

1. A muscle neither pushes nor pulls — no support
2. A muscle is able only to pull, never to push — ← Mova's choice · ✓ the right answer · score 12
3. A muscle is able only to push, never to pull — score 11
4. A muscle is able both to push and to pull — score 12

Why: It took the question to ask who or what does it. It chose option 2 with score 12, tied with another option at 12 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 31, line 5: «Muscles move the bones. A muscle can only pull, never push, so muscles work in pairs: when you bend your arm the biceps at the front pulls, and to straighten i…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same doer «muscle» (+4); the same action «pull» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Identify the longest bone of the human body.

1. The backbone, or the spine — ← Mova's choice · no support
2. The shin bone, or the tibia — no support
3. The thigh bone, or femur — ✓ the right answer · no support
4. The upper arm bone, or humerus — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/world/31-skeleton-and-muscles/