Skill: write-like-james @ cca3af6 · the build: write-lesson, write-mcqs, write-video-script, write-intro, write-summary @ cca3af6; the non-author review: review-lesson (Roles B and C), review-questions, review-figures, review-accuracy @ cca3af6 (the two blind reads follow)

Topic 33 "Bones and muscles" — your read (8 October 2026)

Skim first

The lessons in teaching order, each with its one rule sentence; then the intro script; then the question types. The review page follows.

The lessons and their rules

Lesson	Atom	Rule sentence
L01 The skeleton: bones that hold you up and protect the soft parts inside	LIF5-061	All the bones together are called the skeleton. The skeleton holds the body up and gives it its shape. The skull protects the brain; the ribs protect the heart and lungs.
L02 The muscles: they pull on bones, and they can only pull	LIF5-062	Muscles pull on bones to move the body. A squeezing muscle gets shorter and pulls. A muscle can pull, never push.
L03 How the skeleton and muscles work together: a pair of muscles at a joint	LIF5-064	A joint: where two bones meet. Bones move at the joints. Muscles work in pairs, one pulling each way.

The intro script (95 words, about 48 s)

Here's Haley on the monkey bars at recess. She hangs by both arms, pulls herself up, and reaches for the next bar. Her arms bend at her elbows, and her legs bend at her knees. Under her skin, hard bones and soft parts are doing all of that work. So what do the bones do, and what moves them? To find out, we will look at the bones inside you, the soft parts round them, and how the two work together to move you. Okay, so are you ready to find out what moves you?

The question types (from `TYPES_G5T33.md`)

Type 1 (easy · MCQ, the parts set / a plain set · 061): which part holds the body (or a neck) up — the skeleton / the heart / the lungs / the stomach; the bones in its neck …
Type 2 (easy · MCQ, the jobs set · 061, 062): which job the skeleton does; what all the bones together are called; a muscle's job — the four jobs (fixed); skeleton / backbone / ribs / skull; the four jobs
Type 3 (easy · MCQ, the bones set · 061): which bone sits under a helmet / a seat belt — the skull / the ribs / the backbone / the leg bones
Type 4 (easy · MCQ, the soft-parts set · 061): which soft part a named bone protected — the brain / the heart and lungs / the stomach / the leg muscles
Type 5 (easy · MCQ · 061): what a boneless body does; which is a job of the skeleton; what gives a hamster its shape — four single statements
Type 6 (easy · MCQ, the squeeze set / plain · 062): what a squeezing muscle does; what a muscle that lets go does; what happens to a squeezing muscle's length — the 2 × 2 squeeze set; four single statements
Type 7 (easy · MCQ, the can-do set · 062): what a muscle can do to a bone — pull only / push only / both / neither
Type 8 (easy · MCQ · 062): what the soft part that squeezes and shortens is — a muscle / a bone / a rib / a skull
Type 9 (easy · MCQ · 062): what moves a monkey's bones — its muscles pulling on them / three wrong movers
Type 10 (easy · MCQ / the joint set · 064): what the place where two bones meet is called; what a joint is — a joint / …; the joint set (fixed)
Type 11 (easy, medium · MCQ · 064): where bones move — at the joints / in the middle of each bone / …
Type 12 (easy, medium · MCQ · 064): what the second muscle of a pair does; how many muscles a bend-and-straighten took — four single statements
Type 13 (medium · MCQ, the bones set · 061): which bone protected the brain / the heart and lungs in a knock — the bones set
Type 14 (medium · MCQ on a drawing · 061, 062): the bone a "?" label points at; the part missing from a jobs table; the word on a blank PULLS chip — four bones; four parts; PUSHES / PULLS / RESTS / BENDS
Type 15 (medium · MCQ · 062): what the muscles are doing while nothing moves — They keep pulling on her bones. / three single statements
Type 16 (easy, medium · MCQ · 062): what the muscles are doing to the bones while the body pushes a bar; what the muscles did to the bones in a leap; what long, thin muscles are doing — four single statements
Type 17 (medium · MCQ, the four-muscles set · 064): which muscle pulls for a named movement — the four muscles (fixed)
Type 18 (medium · MCQ · 064): why a leg bends at the knee — four single statements
Type 19 (medium · MCQ · 064): what the other muscle of the pair is doing — letting go / squeezing too / …
Type 20 (hard · typed · 061): the one word for all the bones together — skeleton, with article forms and child spellings
Type 21 (hard · typed · 061): the bones that protect the heart and lungs — ribs, rib cage, with article forms
Type 22 (hard · typed · 062): the name of the soft part that squeezes and pulls — muscle, with article forms and child spellings
Type 23 (hard · typed · 062): the one thing a muscle can do to a bone — pull, pulls, pulling, pull on it …
Type 24 (hard · multi-select · 062): the TWO things that happen when a muscle squeezes — gets shorter / gets longer / pulls on a bone / pushes on a bone
Type 25 (hard · typed · 064): the name for a place where two bones meet — joint, joints, with article forms
Type 26 (hard · MCQ, the reasons set · 064): why a joint needs two muscles — the four single-statement reasons (fixed)
Type 27 (hard · order · 064): the steps of a bend-and-straighten, first to last — four steps
Type 28 (hard · MCQ · 064): what happens to a knee / an arm when the named muscles swap — four outcomes

Three lessons for three atoms, one organ each and then the two together.

Felix sits his sister's rag doll on the sofa and it flops while he stays up straight, so L01 shows the hard bones under his skin, what they do standing, sitting and lying, and the two that protect soft parts (the skull round the brain, the ribs round the heart and lungs); then all the bones together are named the skeleton.

Gina bends her arm and a lump bulges, so L02 shows the lump short and fat when it squeezes and long and thin when it lets go, names it a muscle, and shows on that one muscle that it pulls the forearm up and never pushes it down.

Haley brings a spoon up and puts it down, so L03 asks what straightens her arm if a muscle can only pull: the arm bends only where two bones meet (a joint, Grade 3's word with its second face), and two muscles are fixed across the elbow, one pulling each way; the same pair at the knee.

"Joint" and "backbone" are recalled from Grade 3, the heart, lungs, brain and stomach from Grade 4; no child voices a belief, because the register names none about bones or muscles.

The non-author review is applied (below). Two cold readers read the bundle next; pictures are placeholders until the text is clean.

Questions for James

none

Applied without asking

8 Oct 2026, the non-author review (review-lesson, review-questions, review-figures, review-accuracy): the arm drawing's back muscle was fixed to the upper-arm bone at both ends on every L03 figure and both item drawings, so it crossed no joint; it is now fixed past the elbow, as the text says. The intro said her body bends "at her elbows and her knees, and nowhere else" (L03 then calls the wrist a joint): it now says her arms bend at the elbows and her legs at the knees. Four bank items and one quiz item carried verdict-and-reason options ("yes, they keep pulling to hold her arms bent"; "letting go, so they pull on nothing"; "two, one pulling each way") against your 28 September ban; each is now four single statements, and the weightlifter item asks what the muscles do to his bones while he pushes a bar up. The order item's second step opened "It", which has no antecedent once shuffled. L02 gained one line placing the heart (a muscle the recall item names) as a muscle fixed to no bone; "the two never pull against each other" lost its absolute; the model skeleton's caption no longer says it stands up because its bones are stiff (it hangs from its stand); the L03 rule card prints the rule line word for word; the heart's label leader no longer runs through a lung; the skeleton gained collarbones; the cat's-jaw item lost "the toy" and "the teeth" as distractors; the typed "pull" item accepts "pull on bones", "it can pull" and "pull it up"; an unplaced item figure was deleted. L01 is 296 words (one repeated doll line cut); L03 is 344 and stays one lesson, because a split would separate the joint run from the pair it exists for. Keys changed: L03-q7 (0 → 1) and the toddler item (D → B); bank letters A 11 · B 12 · C 11 · D 9. Every gate is back at its stated result; the batch is rebuilt and checked, not sent.

The lessons

Everything to rule on is on the Needs James page → the lessons, the open questions and the question types, each a card with buttons

Also on the site

Topic intro and poll · summary and three questions · mixed practice · the PP100 bank · the type sheet

After you answer

Nothing waits on you. The two cold readers read blind/2026-10-08-reviewed/ (102 items; CHANGED_IDS.md points them at the fifteen changed ids first); their agreement with the key is the gate. Then the picture pass renders the five cartoon placeholders (Haley on the monkey bars, Felix and the doll, the model skeleton hanging from its stand, Gina's bent arm, Haley's soup), and the Life-strand batch goes with the others once you have given the go after the Grade 5 sample.

What the reviews found, and what changed

The non-author review (8 October): 31 findings — 4 must-fix, 14 worth fixing, 6 left as simplifications, 7 not errors

Must-fix, all applied. The arm drawing (every L03 figure, the L02 and PP item drawings): the back muscle was fixed to the upper-arm bone at both ends, so the figure showed a muscle that could not straighten the arm under text that says two muscles are fixed across the elbow joint — re-anchored past the elbow, re-rendered, opened on the rebuilt pages. The intro's "and nowhere else". Four verdict-and-reason option sets in the bank (the weightlifter's lone "no" among three "yes" was also the odd one out). The order item's step opening "It".

Worth fixing, all applied. The L03 finger item's bundled counts (now one / two / three muscles); the L03 video deducing "so the elbow is a joint" before saying two bones meet there; the heart scope line in L02; "never pull against each other" softened (both muscles squeezing is how a joint is held stiff — the bucket item); the model-skeleton caption; the heart leader through the lung; floating arm bones (collarbones added); the upper-arm-bone leader ending under the muscle; the L03 rule card printing a different rule from the rule box; an unplaced figure; "she stands on tiptoe" in a table with no "she"; the cat's-jaw distractors; the false "bends only at one place" stem; the owl's semicolon option; the typed "pull" accept list; the elbow why item's stem stating the rule it tests; the recall item bundling "her heart and stomach"; the octopus's "legs"; one repeated doll line cut from L01.

Left as simplifications. L03 at 344 words as one lesson; "blood" / "fur" / "food" as third options for what holds a body up (muscles would be a second key); two bank fillers ("the shape of a box", "the air pushing on them"); the shared table drawer's small text at phone width.

Not errors. The attached knee question and L03-q2 state the definition they ask for (recognition items by design); the cat's-jaw fluency item reusing the article's jaw case on a new animal; the intro tile's "47 questions" (three bank items sit on the protected grade test); the vault tool's S26 reading of three quizzes as one set.

Confirmed right against the standard: the skeleton's three jobs and the two protecting bones; muscles pull and never push; squeezing shortens and thickens; the calf pulls the heel up; the jaw muscles pull the jaw up; the elbow and knee pairs by position; the dancer's ankle; bones move at the joints; "more than 200 bones". Omitted on purpose: tendons, ligaments, muscle and bone names beyond skull / ribs / backbone, two forearm bones, kinds of joint, co-contraction.

The records, in full

The review record (findings table, gates, changed ids)

See REVIEW_G5T33_2026-10-08.md beside this file: the ten Grade 4 faults looked for, the 31-row findings table with each verdict and the rewrite applied, the checks that ran clean, the accuracy confirmations, the changed-id list and every gate's line after the fixes.

The author's build record and type sheet

BUILD_RECORD_G5T33.md (v1, 8 October: structural decisions in place of a blueprint, design-check-sequence records, key strings, the rules applied, the recall bank, the names run, the sentence-atomise table, judgement calls) and TYPES_G5T33.md (28 question types, one exemplar each; the review's changes to types 7, 10, 12, 15, 16 and 27 are marked in place and in a closing note).