AQA A-level biology 3.3 Exchange pt1

A long PowerPoint including everything you need to deliver the following topics, broken up into sections according to the specification.

3.3.1 Surface area to volume ratio
3.3.2 Gas exchange

Key Words & Phrases
Surface area
Volume
Surface area to volume ratio (SA:V)
Diffusion
Diffusion distance
Diffusion rate
Exchange surfaces
Specialised exchange surfaces
Single-celled organisms
Multicellular organisms
Adaptations
Thin membrane
Large surface area
Ventilation
Circulatory system
Mass transport
Metabolic rate
Oxygen uptake
Carbon dioxide removal
Heat loss
Homeostasis
Fick’s Law

Key Words & Phrases Gas Exchange
Gas exchange
Diffusion
Oxygen uptake
Carbon dioxide removal
Concentration gradient
Fick’s Law
Thin exchange surface
Large surface area
Moist surface
Ventilation
Alveoli
Capillaries
Alveolar epithelium
Capillary endothelium
Trachea
Bronchi
Bronchioles
Diaphragm
Intercostal muscles
Inhalation (inspiration)
Exhalation (expiration)
Spiracles (in insects)
Tracheae and tracheoles
Gill filaments and lamellae (in fish)
Counter-current flow
Stomata (in plants)
Guard cells
Palisade mesophyll
Spongy mesophyll
Air spaces in leaves