Opening

GROW · SCIENCE · Lesson 5 of 11

The courier has lost the route

Learning intention

Trace blood through the heart, lungs and body and explain the heart’s pumping job.

A blood token must visit lungs and body.

Can you rescue its route without skipping the heart?

Success looks like

Trace body→right heart→lungs→left heart→body.
Explain that arteries carry blood away and veins return it.
Correct a reversed arrow or oxygen-colour misconception.

Retrieval

GROW · SCIENCE · Lesson 5 of 11

Which system does the delivery?

R1. What does the heart pump?

R2. What do blood vessels carry?

R3. Name a substance tissues need.

I do

GROW · SCIENCE · Lesson 5 of 11

I trace one complete journey

Start at the right side of the heart.

Visit lungs, then the left heart, then body.

The heart is passed twice per complete circuit.

One complete route: two heart sides

Diagram description

Clockwise sequence: Right heart
pumps to lungs; Lungs
oxygen enters blood; Left heart
pumps to body; Body tissues
use oxygen. Clockwise. Colour marks oxygen content,
not the actual colour of blood.

I do

GROW · SCIENCE · Lesson 5 of 11

I name the vessel by direction

An artery carries blood away from the heart.

A vein carries blood towards the heart.

Oxygen content does not define the name.

Name vessels by their direction

Diagram description

A simplified scientific sequence: Heart; Artery:
away from heart; Body tissues. The return route uses veins towards the heart.
The heart-to-lungs artery also goes away.

Continue within this stage’s shared time.

I do

GROW · SCIENCE · Lesson 5 of 11

I explain the pump

Heart muscle contracts to move blood.

Valves help stop backward flow.

A valve guides flow; it does not power the pump.

A pumping chamber and a one-way valve

Diagram description

Schematic cross-section: muscular wall squeezes the chamber, forcing blood through an open outlet valve. A second panel shows a closed valve resisting reverse flow.

Continue within this stage’s shared time.

We do

GROW · SCIENCE · Lesson 5 of 11

Route rescue: four delivery links

Go to interactive investigation

Use the route clues on page 1.

W1. Put A–D into a complete cycle.

Start with A. Explain the next step.

Card	Delivery link
A	Right heart → lungs
B	Lungs → left heart
C	Left heart → body
D	Body → right heart

My response — say it, sketch on paper or type

Route rescue: predict each destination

Predict first, test the model, then explain using the evidence. Move at your own pace; paper W1–W3 tasks assess the same reasoning.

Trace the double circulation

Move the marker one stop at a time. Read what changes at each stop.

Positions and travel time are schematic. The marker represents a tracing point, not blood colour or a whole packet of nutrients.

Decision 1 of 3

Blood leaves the right heart. Where next?

Choose, test, then explain together. Evidence diagrams appear only after your test. Diagram transitions explain the model; they do not represent real elapsed time. Use Pause model to stop transitions and model controls, or your device’s reduced-motion setting. The printed We do activity provides the paper route.

We do

GROW · SCIENCE · Lesson 5 of 11

Find the two broken labels

Fault 1: “Lungs → body, skipping the heart.”

Fault 2: “All veins contain blue blood.”

W2. Repair each with a scientific reason.

My response — say it, sketch on paper or type

Continue within this stage’s shared time.

We do

GROW · SCIENCE · Lesson 5 of 11

An oxygen-poor artery?

W3. The vessel goes from heart to lungs.

Is it an artery or vein?

Decide using direction, then explain colour.

My response — say it, sketch on paper or type

Continue within this stage’s shared time.

Hinge

GROW · SCIENCE · Lesson 5 of 11

Blood leaves the lungs. Where next?

Choose the next main destination in this route.

You do

GROW · SCIENCE · Lesson 5 of 11

Build a reliable route map

Choose one response route.

Show the arrows and explain the pump.

Use the evidence sheet if needed.

My response — say it, sketch on paper or type

You do

GROW · SCIENCE · Lesson 5 of 11

Read your route aloud or silently

Can a token follow every arrow?

Does it return to where it started?

Have you passed through both heart sides?

My response — say it, sketch on paper or type

Continue within this stage’s shared time.

You do

GROW · SCIENCE · Lesson 5 of 11

Check the key

Write “oxygen-rich” and “oxygen-poor”.

Explain that blood itself is red.

Name an artery by direction.

My response — say it, sketch on paper or type

Continue within this stage’s shared time.

Review

GROW · SCIENCE · Lesson 5 of 11

Test another map

Trace one complete journey.

Identify one strong label.

Suggest one specific correction.

My response — say it, sketch on paper or type

Review

GROW · SCIENCE · Lesson 5 of 11

Choose a model improvement

Should the next version add capillaries or chambers?

Explain what that extra detail would help show.

My response — say it, sketch on paper or type

Continue within this stage’s shared time.

Exit

GROW · SCIENCE · Lesson 5 of 11

A route in three answers

E1. After the lungs, where does blood go?

E2. What makes a vessel an artery?

E3. What powers the movement of blood?

My response — say it, sketch on paper or type

My science task sheets

Choose one route with your teacher. Shared evidence and the exit sheet appear in every route. Your work stays here while the page is open; save it before closing.

1 • Shared evidence: the rescue route

The cards describe a simplified circuit. It is a route map, not an anatomical picture.

Route A

Right heart → lungs. Blood is oxygen-poor on the way to the lungs.

Route B

Lungs → left heart. Blood has gained oxygen in the lungs.

Route C

Left heart → body. Blood delivers oxygen to tissues.

Route D

Body → right heart. Returning blood is oxygen-poor, not oxygen-free.

Vessel key

Artery = away from heart. Vein = towards heart. Capillaries allow exchange with tissues.

Pump and colour key

Heart muscle contracts; valves help prevent backflow. Human blood is red. Blue lines in models mean oxygen-poor.

W1. Put A–D in cycle order, starting with A. Where does blood gain oxygen?W2. Repair “lungs straight to body” and “all veins contain blue blood”.W3. Name the heart-to-lungs vessel type. Explain using direction.

2 • Supported route: follow the token

Use page 1. Words to use: right heart / lungs / left heart / body.

S1. Complete the route: BODY → ____ → ____ → ____ → BODY.

S2. Where does blood gain oxygen? Lungs Heart muscle

S3. A vessel carries blood away from the heart. It is an … Artery Vein

S4. Complete: Heart ____ contract to pump ____ . Valves help prevent ____ flow. Word bank: backward / muscles / blood.S5. Explain what blue means on a blood-flow diagram. What colour is blood?S6. Draw the complete route with four arrows.

3 • Standard route: repair the map

Use page 1. Labels must remain clear if printed without colour.

N1. Draw a complete cycle using both heart sides, lungs and body. Mark where oxygen enters the blood.

Direction	Artery or vein?
Right heart → lungs
Lungs → left heart
Left heart → body
Body → right heart

N2. Complete the table and explain the rule you used.N3. Explain the different jobs of heart muscle and valves.N4. Repair: “The blue vessel must contain blue blood.”

4 • Stretch route: audit a teaching model

A good model must be accurate about the relationships it shows.

T1. Repair and redraw: right heart → body → lungs → left heart → right heart.T2. Explain why an oxygen-poor artery is possible. Give the route.T3. Describe how the heart muscle and valves work together. Which supplies the pumping force?T4. Identify two limits of a four-box route model. Explain one useful detail to add.

5 • Exit and reflection

Use direction words, not just colours.

E1. Where does blood travel immediately after the lungs in our route?E2. What defines an artery?E3. What produces the force that pumps blood?E4. What does blue mean in this model? Is blood blue?Reflection. Which route error can you now explain?