Organ systems

Classroom resources

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Students will be able to

• I can name organs of an animal and a plant system and say what each does.
• I can say how the organs work as a system.
• I can compare the two systems.

Timing

Engage 3 min · Explain 9 min · Evaluate 3 min · Typical adds 1 min, Wider about 1 min

Before class

A short questions-led lesson with no simulation, following Tissues and organs. Set the width with ?width=minimum, typical (default) or wider. It is the key node of the unit (★) and rewards diagrams and models more than screens: a hand pump and tubing model of the circulatory system works well.

Board notes: none. Systems are simplified: the circulatory system has a double loop (heart to lungs and back, heart to body and back) that the Year 8 descriptor doesn't require.

Running the lesson

1. Engage: tally the predictions. Ask the 'nothing' group what the leg needs from the blood.
2. Explain: the two matches and the shared problem are the success criteria.
3. In your own words: the two labelled diagrams.

The hard part (on purpose)

Seeing the system, not a list of parts. When a student lists organs, ask them what job would stop if one were removed.

When students get stuck

Answers to the checks

1. Engage: one organ goes wrong: In the circulatory system, the heart pumps blood through blood vessels to all parts of the body. If the blood vessels to one leg are blocked, what is most likely?
   The leg is starved of oxygen and nutrients. A system only works when every organ in it does its part: pump, vessels and blood together.
2. Circulatory system: Match each part of the circulatory system to its job.
   Heart → D. Pumps blood around the body; Arteries → A. Carry blood away from the heart at high pressure; Veins → C. Carry blood back to the heart; Capillaries → E. Thin walls let oxygen and nutrients pass into cells; Blood → B. Carries oxygen, nutrients and waste
3. Plant system: Match each part of a plant's vascular system to its job.
   Roots → D. Take in water and minerals from the soil; Xylem → C. Carries water and minerals up the plant; Phloem → B. Carries sugars from the leaves to where they are needed; Leaves → A. Make sugars by photosynthesis and lose water vapour
4. The shared problem: What survival problem do the circulatory system and a plant's vascular system both solve?
   Moving materials (nutrients, water, gases) to every cell that needs them
   Cells deep inside a body can't get what they need by themselves, so both kinds of organism use a transport system.
5. The difference: How is the plant's system different from the animal's?
   A plant has no pump: water is pulled up by evaporation from the leaves, and the tubes are fixed in place
   Animals actively pump a liquid round a loop; plants move water upward in tubes as it evaporates from the leaves. Different bodies, same problem.
6. Elaborate: the digestive system: In digestion, food goes mouth, then stomach, then small intestine. If the small intestine fails to absorb nutrients, what is the effect on the system?
   The system fails at its job: food is broken down but the nutrients never get into the blood
   Each organ does a step in the job. If any step fails, the system fails to do its whole job.
7. Elaborate: a machine for an organ: A dialysis machine cleans the blood of someone whose kidneys no longer work. What does it do that the kidney does?
   Filters waste out of the blood, while keeping useful things in
   To replace an organ you must copy what it does. Here the machine filters waste out of the blood, as the kidney does.

Stretch and support

Stretch: Why do large animals and tall trees both need transport systems, when a single-celled organism doesn't? (Diffusion works over tiny distances only.)

Support: Give a diagram of each system with the organs unlabelled and a word bank, and ask students to add one arrow for the direction of flow.

Coach prompt (optional)

For a student who has done the lesson and is still stuck. They paste it into an AI tool your school allows; it asks questions about this lesson's one idea and doesn't give answers. Students see it on the course recap page only through a link ending in ?coach=1: recap with coach prompts.

You are a patient science coach for a Year 8 student in Australia. Help me understand ONE idea only, from the lesson "Organ systems".

The idea: Organ systems — coordinated organs enabling survival: I can describe how organs within a system coordinate to perform a survival function, applying this to one animal and one plant system.

What understanding looks like:
- Names the organs of one animal and one plant system and explains the function of each
- Explains how the coordinated system enables a specific survival function
- Compares one plant and one animal system as solutions to a shared survival problem

Mistakes students often make here:
- A student says the heart makes blood.
- A student says plants have no system because they have no heart.

How to coach me (rules from the Waypoints Kit coach):
- Ask me one short question at a time (2 to 4 sentences) and wait for my answer. Never give me the answer before you have heard my thinking, and don't hide the answer inside your question.
- Start in Discover: ask me to explain the idea in my own words, or to predict what happens in a simple example. I can switch any time: "teach it back" (you play a beginner and I explain), "spot the flaw" (you show me an answer with one common mistake and I find it), or "check" (I explain, and you tell me what is solid and what to revisit).
- If I am stuck or say "just tell me", ask what I think first, then give a small hint or a simpler example. Explain only after I have had a real go.
- If I seem to be missing the idea that comes before this one (Organs — tissues working together for an integrated function), check it quickly, then come back.
- Stay in this idea: don't teach later ideas or add extra content. If I ask about something else, say it is for another lesson and bring me back.
- After you help, ask me one reflective question, such as how I know my answer is right or what I would check.
- Praise my effort and method, not my ability.
- You can be wrong: if I rely on something you said, remind me to check it against my notes or the lesson. If you don't know, say so.
- Use simple words.
- Stop when I can explain the idea in my own words and get one new example right. Then tell me to go back to the lesson "Organ systems".

Exit ticket

Say in a sentence how a plant's vascular system and an animal's circulatory system are alike, and one way they differ.

Alike: both move materials to every cell. Different: the animal pumps blood with a heart, while the plant has no pump and water is pulled up the xylem as it evaporates from the leaves.

What each step is for

• Engage: one organ goes wrong: Students treat each organ as independent. A system is defined by organs doing a job together, so failure of one affects the whole.
• Explain: systems at work: Naming organs and their jobs, explaining how they coordinate, and comparing a plant and an animal system as answers to one problem meets the three success criteria.
• Elaborate: the digestive system: A second animal system shows that the same analysis (organs, jobs, coordination) works for any system.
• Elaborate: a machine for an organ: Artificial organs show the function an organ must perform, because engineers must copy it.

Where it leads

Next: Year 9 coordination and signals.

In class: model circulatory system with a hand pump and tubing; celery in coloured water to show xylem; take a pulse before and after exercise.