**This Powerpoint specifically uses the Cambridge AS Level Biology Syllabus and covers all criteria for – Unit 1.1 The Gas exchange system
**
Students will be able to -

1 describe the structure of the human gas exchange system,
limited to:
• lungs
• trachea
• bronchi
• bronchioles
• alveoli
• capillary network

2 describe the distribution in the gas exchange system
of cartilage, ciliated epithelium, goblet cells, squamous
epithelium of alveoli, smooth muscle and capillaries

3 recognise cartilage, ciliated epithelium, goblet cells,
squamous epithelium of alveoli, smooth muscle and
capillaries in microscope slides, photomicrographs and
electron micrographs

4 recognise trachea, bronchi, bronchioles and alveoli in
microscope slides, photomicrographs and electron
micrographs and make plan diagrams of transverse sections
of the walls of the trachea and bronchus

5 describe the functions of ciliated epithelial cells, goblet cells
and mucous glands in maintaining the health of the gas
exchange system

6 describe the functions in the gas exchange system of
cartilage, smooth muscle, elastic fibres and squamous
epithelium

7 describe gas exchange between air in the alveoli and blood in
the capillaries

**Every Powerpoint includes learning objectives, a starter and plenary, suitable activities and review questions with mark scheme. We also provide a FREE pdf version of the file so it can easily be printed for students as a handout or uploaded to the school VLE system
**

Bring your Cambridge AS Level Biology lessons to life with our expertly designed teaching resources. Each unit is tailored to the latest syllabus, offering ready-to-use lesson plans, engaging experiments, and visually clear notes that save hours of prep time. Whether you’re new to the course or refining your approach, The Science Shelf gives you everything you need to boost student understanding and exam success — all in one place.