The human body deeper: the heart and blood in amazing numbers

Tests: 7 of 12 right · Exam: 1 of 4 right · Kind: plain · Understood: 13 of 16 · Run: 2026-10-18, commit f3c23ea72

Lesson 261 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 · right ✓

«my sister says blood is blue till it hits the air, look at my veins, they're blue innit» What is right?

1. Yes, blood is blue inside you and turns red the moment that air touches it — score 6
2. No, blood is green inside and red outside — no support
3. No, blood is always red; veins only look blue through the skin — ← Mova's choice · ✓ the right answer · score 9
4. Yes, but only in your arms — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 9, against 6 for the next best. Its support: lesson 65, line 4: «Blood is always red, bright red with oxygen and dark red without, even though veins look blue through your skin.», reached through the option's own match among the sentences about the question's things. What matched: the same action «look» (+4); the same doer «veins» (+2); the same property (+2); the same circumstance (+1). · the question and its options parsed, with trees and pragmatics

Test 2 · right ✓

In Tom and Jerry, Tom's heart bursts out of his chest and thumps in the air when he sees a pretty cat. What really happens when you are excited?

1. The heart really does jump a little way up out of the chest, then drops back — no support
2. The heart beats faster, but it stays safely inside the ribs — ← Mova's choice · ✓ the right answer · score 6
3. The heart stops until you calm down — score 1
4. The heart swells to twice its size — score 0

Why: It took the question to ask what happens next. It chose option 2 with score 6, against 1 for the next best. Its support: lesson 261, line 5: «Cartoons like Tom and Jerry show a heart bursting out of Tom's chest when he falls in love, but a real heart stays safely inside the ribs, beating faster when…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «real heart» (+3); the same action «beat» (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics

Test 3 · right ✓

Count them: 3 children each give blood twice a year, half a litre each time. How much blood is given in a year?

1. 3 litres — ← Mova's choice · ✓ the right answer · no support
2. 6 litres — no support
3. 2 litres — no support
4. 1.5 litres — 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 4 · right ✓

«a mouse heart vs an elephant heart, which one beats faster, go»

1. Neither, mice have no heart — no support
2. The mouse's, because small animals have fast hearts — ← Mova's choice · ✓ the right answer · score 6
3. The elephant's, because big hearts are stronger and beat harder — score 6
4. They beat exactly the same — no support

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 261, line 17: «A blue whale's heart weighs about 180 kilograms and can beat as slowly as two times a minute on a deep dive; small animals have fast hearts and big animals slo…», reached through the same lesson line as the sentence the question matched. What matched: the same thing acted on «fast hearts» (+3); the same light verb (be, have, do, get, go) (+2); the same doer «small animals» (+1). · the question and its options parsed, with trees and pragmatics

Test 5 · wrong ✗

What would happen if your blood had no platelets?

1. A small cut would keep bleeding and not make a scab — ✓ the right answer · no support
2. Your bones would stop making blood — ← Mova's choice · score 1
3. You would not be able to feel your pulse in your wrist or your neck — no support
4. Your blood would turn blue — score 1

Why: It took the question to ask what happens next. It chose option 2 with score 1, tied with another option at 1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 65, line 13: «In 1628 William Harvey showed that the same blood goes round and round the body, when many people still believed blood was made fresh in the liver and used up;…», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+1). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 6 · wrong ✗

«mum gave blood today, she's got loads less now, will she run out??» What is best?

1. No, because she gave only white blood cells — no support
2. No, half a litre is a small part of her 5 litres and her body makes it again — ✓ the right answer · no support
3. Yes, blood never grows back in grown-ups, so it is gone for ever — no support
4. Yes, she has given away almost all of the blood she had — ← Mova's choice · score 4

Why: It took the question to ask which statement is true. It chose option 4 with score 4, the only option with support. Its support: lesson 261, line 4: «Blood is never blue: it is bright red when it is full of oxygen and darker red when it has given some away; veins only look blue because of the way skin lets l…», reached through the option's own match among the sentences about the question's things. What matched: the same action «give away» (+4); the same property (+2). Against it: a different doer (counts against) (-2). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

Count them: a doctor listens to 2 elephants with a giant stethoscope. How many trunks, tails and hearts are there in all?

1. 4 trunks, 2 tails and 2 hearts — ← Mova's choice · score 6
2. 2 trunks, 2 tails and 2 hearts — ✓ the right answer · score 6
3. 2 trunks, 2 tails and 4 hearts — score 6
4. 2 trunks, 4 tails and 2 hearts — score 6

Why: It took the question to ask what it is done to. It chose option 1 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 149, line 3: «Mice do not crawl up elephant trunks either: the trunk is a mighty muscular nose that blows dust and water over the elephant's back and could snort out any int…», reached through the option's own match among the sentences about the question's things. What matched: the same light verb (be, have, do, get, go) (+2); it fills the role the question asks for (+2); the same doer «trunk» (+1); the same thing acted on «mighty muscular nose» (+1). The right option, 2, scored 6. · the question and its options parsed, with trees and pragmatics

Test 8 · right ✓

Before 1816, how did a doctor usually listen to a patient's heart?

1. By squeezing the patient's wrist very hard and counting — no support
2. By tapping the head with a hammer — score 6
3. By putting an ear straight onto the chest — ← Mova's choice · ✓ the right answer · score 14
4. By looking into the mouth with a lamp — no support

Why: It took the question to ask what something is like. It chose option 3 with score 14, against 6 for the next best. Its support: lesson 261, line 16: «The stethoscope was invented in 1816 by René Laennec, who first used a rolled-up tube of paper to listen to a heart; before that, doctors put an ear straight o…», reached through the same lesson line as the sentence the question matched. What matched: the same action «put» (+5); the same doer «doctors» (+3); the same thing acted on «ear» (+3); the same place «chest» (+3). · the question and its options parsed, with trees and pragmatics

Test 9 · right ✓

«bone marrow's just fat in bones, it's for dogs to eat lol» What is right?

1. Red bone marrow makes your blood cells, millions every second — ← Mova's choice · ✓ the right answer · score 9
2. Marrow is where the body keeps its air — no support
3. Right, marrow does nothing for the body, it is just soft filling — no support
4. Marrow makes your bones grow longer only, nothing else at all — score 6

Why: It took the question to ask which statement is true. It chose option 1 with score 9, against 6 for the next best. Its support: lesson 64, line 13: «Living bone is wet and full of blood vessels and nerves, and the soft marrow inside many bones makes millions of new blood cells every second.», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+4); the same doer «soft marrow» (+2); the same property (+2); the same thing acted on «millions» (+1). · the question and its options parsed, with trees and pragmatics

Test 10 · wrong ✗

A blue whale dives deep and stays down a long time. What happens to its heartbeat?

1. It stops completely until the whale comes up — ← Mova's choice · score 6
2. It beats exactly like a child's heart — score 3
3. It speeds up to a thousand beats a minute — score 6
4. It slows down, to as little as two beats a minute — ✓ the right answer · no support

Why: It took the question to ask which statement is true. It chose option 1 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 26, line 10: «Humpback whales work together to blow a spiral net of bubbles that traps a shoal of fish, then rise through it with mouths open.», reached through the option's own match among the sentences about the question's things. What matched: the same action «rise» (+4); the same doer «humpback whales» (+2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 11 · wrong ✗

Before blood groups were known, giving one person's blood to another often went badly. Why?

1. Blood always went bad as soon as it left the body — score 2
2. Doctors used animal blood, from sheep and calves, instead of human blood — score 3
3. People got blood that was too cold — ← Mova's choice · score 4
4. Some blood groups do not mix safely, and nobody knew which — ✓ the right answer · score 4

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 123, line 15: «In a duck's legs, warm blood going down heats the cold blood coming back, so the feet stay just warm enough not to freeze on ice.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «cold blood» (+3); the same property (+1). The right option, 4, scored 4. · the question and its options parsed, with trees and pragmatics

Test 12 · right ✓

«ran round the field twice, my heart's going mental, is it broken» What is most likely?

1. No, a heart beats faster in exercise to send more blood to the muscles — ← Mova's choice · ✓ the right answer · score 6
2. No, it is your lungs beating, not your heart — no support
3. Yes, a heart should beat the same all the time, whatever you are doing — score 6
4. Yes, running damages the heart every time — no support

Why: It took the question to ask a circumstance (with what, when, how). It chose option 1 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 261, line 5: «Cartoons like Tom and Jerry show a heart bursting out of Tom's chest when he falls in love, but a real heart stays safely inside the ribs, beating faster when…», reached through the option's own match among the sentences about the question's things. What matched: the same action «beat» (+2); the same doer «real heart» (+2); the same property (+2). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal function of the red blood cells within the human circulatory system.

1. The formation of scabs upon wounds — ← Mova's choice · no support
2. The destruction of invading micro-organisms — no support
3. The production of the heart's audible sounds — no support
4. The conveyance of oxygen to the tissues of the body — ✓ 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

Exam question 2 · formal language · right ✓

Select the response consistent with the established facts concerning the colour of human blood within the veins.

1. It is colourless until it reaches the heart — no support
2. It is blue, becoming red only upon exposure to the atmosphere — score 2
3. It is purple in children and red in adults — no support
4. It is red of a darker shade, the appearance of blueness arising from the passage of light through the skin — ← Mova's choice · ✓ the right answer · score 6

Why: It took the question to ask which statement is true. It chose option 4 with score 6, against 2 for the next best. Its support: lesson 261, line 10: «Blood is always red, bright when it carries plenty of oxygen and darker when it carries less; veins look blue only because of how light passes through skin.», reached through a sentence linked to the one the question matched. What matched: the same action «pass» (+3); the same doer «light» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Ascertain the anatomical site in which red blood cells are principally produced.

1. The air sacs of the lungs — ← Mova's choice · no support
2. The lining of the stomach — no support
3. The chambers of the heart — no support
4. The marrow within the bones — ✓ 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

Exam question 4 · formal language · wrong ✗

Which of the following statements most accurately characterises the relationship between the size of an animal and the rate of its heartbeat?

1. The rate of heartbeat is determined solely by colour — no support
2. Smaller animals generally possess faster heartbeats, and larger animals slower ones — ✓ the right answer · no support
3. All animals possess an identical rate of heartbeat — no support
4. Larger animals invariably possess faster heartbeats, their hearts being larger and stronger — ← Mova's choice · score 5

Why: It took the question to ask who or what does it. It chose option 4 with score 5, the only option with support. Its support: lesson 261, line 1: «Your heart is a muscle about the size of your own fist, and it never takes a day off: it squeezes blood out with every beat, more than 100,000 times a day.», reached through the remembered sentence the question matched. What matched: the same light verb (be, have, do, get, go) (+3); it fills the role the question asks for (+2). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

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