Science at key stage 3 (Year 8)

Unit 8B: Respiration

Prior learning

It is helpful if pupils know:

that air contains carbon dioxide and oxygen, with other gases
that smaller molecules, including glucose, are produced from larger ones in digestion
that the heart pumps blood to circulate it through the body
that cells are organised into tissues and tissues can form organs
how breathing varies according to the body's needs

Sections in this unit

This unit is divided into sections. Each section contains a sequence of activities with related objectives and outcomes. You can view this unit by moving through the sections or print/download the whole unit.


	1. a. How do cells use the food molecules absorbed after digestion?
	2. b. How do cells use the food molecules absorbed after digestion?
	3. c. How do cells use the food molecules absorbed after digestion?
	4. d. How do cells use the food molecules absorbed after digestion?
	5. a. How does the oxygen needed for respiration reach the tissues of the body?
	6. b. How does the oxygen needed for respiration reach the tissues of the body?
	7. What happens to the oxygen when it reaches the cells?
	8. Checking progress
	9. What is the role of the lungs?
	10. How are inhaled and exhaled air different?
	11. a. Do other organisms respire in a similar manner?
	12. b. Do other organisms respire in a similar manner?
	13. Reviewing work