Cells, bones and muscles

Tests: 6 of 11 right · Exam: 2 of 4 right · Kind: plain · Understood: 7 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 64 of the biology 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 ✗

my mate says skeletons are just dead stuff inside u like a statue. true?

1. No, bones are made of muscle — ← Mova's choice · no support
2. Yes, but they come alive at night — no support
3. Yes, bones are dead and dry from birth, like the stones in a wall — no support
4. No, living bone is wet, full of blood vessels and makes blood cells — ✓ the right answer · 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 2 · right ✓

In a cartoon a skeleton walks around with no muscles at all. Why could a real one never move?

1. Bones can only move when muscles pull on them — ← Mova's choice · ✓ the right answer · score 6
2. Real skeletons are far too heavy to walk on their own — no support
3. Real skeletons have too few bones — score 4
4. Skeletons need batteries to walk — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 6, against 4 for the next best. Its support: lesson 64, line 16: «Muscles move bones by pulling, never pushing; the biceps on the front of the arm shortens to bend the elbow, and the triceps at the back pulls to straighten it.», reached through the cause of the sentence the question matched. What matched: the same action «pull» (+5); the same doer «muscles» (+1). · the question and its options parsed, with trees and pragmatics

Test 3 · wrong ✗

What would happen if your elbow were a ball-and-socket joint instead of a hinge?

1. Your arm would be much shorter — no support
2. Nothing would change at all — no support
3. You could not bend your arm at all, not even to eat your dinner — ← Mova's choice · score -4
4. Your forearm could swing in many directions instead of one — ✓ the right answer · no support

Why: It took the question to ask what happens next. It chose option 3 with score -4, the only option with support. Its support: lesson 64, line 14: «Joints are where bones meet; the knee and elbow are hinge joints that bend one way like a door, while the shoulder and hip are ball-and-socket joints that turn…», reached through what followed the sentence the question matched. What matched: the same action «bend» (+4). Against it: a different doer (counts against) (-2); one says «not», the other does not (counts against) (-6). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 4 · right ✓

Ben says the triceps pushes his arm straight. Is he right?

1. No, the biceps pushes it straight — no support
2. Yes, all arm muscles push — score 0
3. Yes, the triceps is the only muscle in the whole body that pushes — no support
4. No, the triceps pulls to straighten it; muscles never push — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask which statement is true. It chose option 4 with score 8, against 0 for the next best. Its support: lesson 64, line 16: «Muscles move bones by pulling, never pushing; the biceps on the front of the arm shortens to bend the elbow, and the triceps at the back pulls to straighten it.», reached through the remembered sentence the question matched. What matched: its «because» matches the remembered cause (+4); the same action «pull» (+2); the same doer «triceps» (+2). · the question and its options parsed, with trees and pragmatics

Test 5 · wrong ✗

ugh legs are dead after that hike. coach says its lactic acid stuck in them. right?

1. Yes, and it slowly turns into bone if you don't stretch it out — ← Mova's choice · no support
2. No, the soreness is tiny muscle tears being repaired — ✓ the right answer · no support
3. Yes, the acid stays in the legs for days — no support
4. No, it means your bones are broken — 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 6 · right ✓

An astronaut grows a few centimetres taller in space. Why?

1. With no gravity squashing them, the discs in the spine stretch out — ← Mova's choice · ✓ the right answer · score 4
2. The rocket stretches people as it takes off at high speed — no support
3. The cold of space makes bones longer — no support
4. Space food makes bones grow — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 4, the only option with support. Its support: lesson 64, line 19: «You are about 1 centimetre taller in the morning than at bedtime, because the soft discs between the bones of your spine are squashed during the day and fill u…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «gravity» (+4); the same action «squash» (+2). Against it: a different thing acted on (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

Mia marks her height at 7 in the morning and at 9 at night. What will she find?

1. She is exactly the same height — ← Mova's choice · no support
2. She is taller at night after dinner — no support
3. She is 10 centimetres taller at night than in the morning — no support
4. She is about 1 centimetre shorter at night — ✓ the right answer · 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 8 · right ✓

A doctor looks at an X-ray and sees a dark line across a white bone. What does it show?

1. A healthy growing bone — no support
2. A spot where the X-ray ran out — no support
3. A break in the bone — ← Mova's choice · ✓ the right answer · score -2
4. A blood vessel in the arm — no support

Why: It took the question to ask what it is done to. It chose option 3 with score -2, the only option with support. Its support: lesson 64, line 12: «Bones show white on an X-ray because the calcium in them stops X-rays more than soft muscle and skin, and a break shows as a dark line; bone cells slowly rebui…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+2); the same thing acted on «break» (+1). Against it: a different action (counts against) (-2); a different doer (counts against) (-3). · the question and its options parsed, with trees and pragmatics

Test 9 · wrong ✗

Why can you still breathe and your heart still beats while you sleep?

1. You wake up every minute to work them — ← Mova's choice · no support
2. Some muscles work by themselves without you deciding — ✓ the right answer · no support
3. You dream about breathing — no support
4. Muscles store all the beats in the daytime — 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 ✓

Why does a broken arm need a cast for weeks?

1. Living bone mends itself slowly and must be kept still — ← Mova's choice · ✓ the right answer · no support
2. The cast keeps germs out of the bone only — no support
3. Bones never mend, so the cast stays for life — no support
4. The cast makes new bone out of plaster — 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 11 · right ✓

In a game a hero's broken bone heals by eating one apple. What really happens?

1. The broken bone is pushed out and a new one grows in its place — no support
2. The bone heals in a second with food — no support
3. Bones never heal once broken — no support
4. Bone cells slowly rebuild the break over several weeks — ← Mova's choice · ✓ the right answer · score 13

Why: It took the question to ask which statement is true. It chose option 4 with score 13, the only option with support. Its support: lesson 64, line 12: «Bones show white on an X-ray because the calcium in them stops X-rays more than soft muscle and skin, and a break shows as a dark line; bone cells slowly rebui…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «bone cells» (+5); the same action «rebuild» (+4); the same thing acted on «break» (+2); the same property (+2). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

Identify the principal reason for which the skeleton of an infant comprises a greater number of bones than that of an adult.

1. Certain bones fuse together in the course of growth — ← Mova's choice · ✓ the right answer · no support
2. Infants possess additional temporary bones that are shed — no support
3. Adults lose bones through injury — no support
4. The bones of adults are absorbed into muscle — 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 · wrong ✗

Which of the following statements most accurately characterises the action of skeletal muscle upon bone?

1. Muscle rotates bones by spinning them within their sockets — score 11
2. Muscle acts exclusively by pushing — ← Mova's choice · score 16
3. Muscle acts upon bone only during sleep — score 14
4. Muscle acts only by pulling, often in opposing pairs — ✓ the right answer · score 16

Why: It took the question to ask who or what does it. It chose option 2 with score 16, tied with another option at 16 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 64, line 16: «Muscles move bones by pulling, never pushing; the biceps on the front of the arm shortens to bend the elbow, and the triceps at the back pulls to straighten it.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+5); the same action «move» (+4); its «because» matches the remembered cause (+4); the same doer «muscles» (+3). The right option, 4, scored 16. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

It is asserted that bone within the living body is a dry and inert material. Select the response consistent with the established facts.

1. The assertion is false; living bone is vascular and produces blood cells — ← Mova's choice · ✓ the right answer · no support
2. The assertion is true after the age of ten — no support
3. The assertion is true of all bones — no support
4. The assertion is true of the bones of the leg only, those of the arm being living — 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 4 · formal language · wrong ✗

Ascertain the cause of the diurnal variation in human stature of approximately one centimetre.

1. The nightly growth of the long bones — ← Mova's choice · no support
2. The contraction of the heart muscle — no support
3. Compression and recovery of the intervertebral discs — ✓ the right answer · no support
4. The swelling of the feet by evening — 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/biology/64-cells-bones-and-muscles/