• Quick retrieval from earlier learning (Homeostasis and negative feedback loops). Students answer on mini whiteboards.
• Show answers together and note who needs support in the main task.

1. In a control system, what role do these play: temperature receptors in the skin? (receptor / coordination centre / effector) → receptorPrompt: Detect → decide → respond.
2. Why is it important to keep internal conditions within narrow limits? (So that we never feel hungry / Enzymes and cells only work well in a narrow range of conditions / It is not important / So that hair grows faster) → Enzymes and cells only work well in a narrow range of conditionsPrompt: What happens to enzymes at the wrong temperature or pH?
3. Homeostasis: which statement is NOT true? (Negative feedback makes changes bigger. / Body temperature is kept close to 37 °C. / Homeostasis uses both nervous and hormonal responses. / In negative feedback, a rise in a value triggers changes that lower it.) → Negative feedback makes changes bigger.Prompt: Which part detects and which part responds?

• Ask everyone to find their pulse, then jump for 30 seconds and find it again.
• Share the objective: How the body warms up and cools down. Read the success criteria together.

• Work through the example out loud, saying why you do each step, not just what you do.
• Example: When does this happen: shivering?
• Step 1: When too cold, the body reduces heat loss and releases more heat.
• Step 2: So the answer is: response when too cold
• Answer: response when too cold
• Pause after each step and ask a student to say what comes next.

• Do these together. Students try each step on whiteboards before you reveal it.
• Use the hints as prompts rather than giving the answer.

1. When does this happen: vasoconstriction: blood vessels near the skin narrow? (response when too hot / response when too cold) → response when too coldPrompt: Does it help lose heat or keep it?
2. Which part of the brain monitors blood temperature? (the spinal cord / the cerebellum / the thermoregulatory centre (hypothalamus) / the retina) → the thermoregulatory centre (hypothalamus)Prompt: It sits at the base of the brain near the pituitary gland.

• Students work on the student sheet. Circulate and check the first two answers of every student early.
• Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

• Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.

1. Why does shivering warm you up? (Rapid muscle contractions increase respiration, which releases heat / It makes sweat / It shakes cold air away / It widens blood vessels) → Rapid muscle contractions increase respiration, which releases heatPrompt: Muscles need energy to contract.
2. Temperature control: which statement is NOT true? (Shivering cools the body down. / The hypothalamus contains the thermoregulatory centre. / Normal human body temperature is about 37 °C. / Vasoconstriction reduces heat loss from the skin.) → Shivering cools the body down.Prompt: Do blood vessels actually move?

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-10.