Body Systems
Summary: Tags: science oxford-science student-book-7 biology Created: 2026-05-19 Last Updated: 2026-05-19
2 Body systems
In this chapter, you will:
- look at the levels of organization that exist in a multicellular organism
- focus on two organ systems in detail – the respiratory and skeletal systems
- find out how your lungs help you breathe and how your skeleton does more than you might think
- find out how Energy is transferred from the food you eat to your Cells, through the process of Respiration
- compare aerobic respiration with anaerobic respiration in animals and fermentation in microorganisms.
Think back
- Draw a simple plant or animal cell and label its parts.
- Describe the process of Diffusion.
- Name a bone and describe its function (job) in the body.
Key ideas Cells are the smallest working unit in an organism. The shape and structure of a specialized cell allows it to perform a particular function. Glucose and oxygen diffuse into cells from the blood. Skeletons are made of bones. Respiration takes place inside mitochondria. Oxygen is used in respiration to transfer energy for the organism.
How to read and understand a simple pie chart How to calculate lung volume
Journey through body systems What do I already know? - Breathing and exercise
- Muscles, the skeleton, and movement
- Cells as the basic unit of organization
- Roles of special cells in the body
- Movement of substances between cells and organs This chapter - 2.1 Levels of organization
- 2.2 Skeleton
- 2.3 Movement: joints
- 2.4 Movement: muscles
- 2.5 Breathing: lungs
- 2.6 Breathing: gas exchange
- 2.7 Aerobic respiration
- 2.8 Anaerobic respiration What comes next? - Nutrients
- Digestive system
- Bacteria and enzymes in digestion
- Cell systems
- Reproduction
- Fertilization and implantation