The Respiratory System: Respiration

What We Will Learn Today

• Recall breathing system parts, how it works, and gas swap
• Understand difference between breathing and respiration
• See respiration equation and why it matters for body
• Explore respiration with activities and talks

Key Words

• Cellular respiration
• Glucose
• Oxygen
• Carbon dioxide
• Energy
• Aerobic respiration
• Anaerobic respiration
• Diffusion

Breathing System Recap

• What do you remember?
• Air pathway
• Breathing faster in exercise
• Smoking effects
• Arrow to: What happens to oxygen next?

Think-Pair-Share

• What is the difference between breathing and using food for energy?
• Think alone: 30 seconds
• Pair discuss: 1 minute

Labelling Activity

• Discuss in pairs: 1 minute
• Come up: Place label, say name + function
• How many labels should the diagram have?

Correct Labels

Gas Exchange in Alveoli

• Oxygen from air to blood
• Carbon dioxide from blood to air (exhale)

Think-Pair-Share (Part 2)

• Once oxygen is in the blood from the alveoli, where does it go next and why do our body cells need it?
• Think alone: 20 seconds
• Pair discuss: 40 seconds

Cellular Respiration – Energy for All Living Things

• All living things respire: animals, plants, bacteria
• Energy for growth, movement, repair
• Breathing: air in/out. Respiration: chemical in cells

Respiration Recipe Activity

• Pairs: Discuss and fill sheet (2 mins)
• Ingredients from food/air? Products/waste?

Equation Builder

• Pairs: Arrange word cards (2 mins)
• Explain to partner: Why does body need this?

Correct Equation

• Glucose + Oxygen → Carbon Dioxide + Water + Energy

Limewater Test for CO2

• Purpose: Prove cells produce CO2 in respiration

Safety Rules

• Careful handling, no ingestion
• Wash hands if contact
• Blow gently, no sucking
• Straws single-use, no horseplay

Step-by-Step Instructions

• Pour limewater into test tube
• Insert straw
• Blow gently 10-20 seconds
• Observe milky change from CO2

What We Observed

• Glucose + Oxygen → CO2 + Water + Energy

3 Stars & 1 Wish

• Write 3 things you learned (stars)
• Write 1 question you have (wish)
• Hand in as you leave

What You Can Do Now

• Recall breathing system parts, functions, processes
• State/explain respiration equation
• Show understanding through activities

Homework

• Complete worksheet
• Write up limewater experiment in notes
• Due next class (marked)