AQA A Level Biology复习笔记3.2.7 PVR
Maths Skill: PVR The volume of air within the lungs of an individual will change depending on their level of activity When at rest, breathing is shallow and steady When exercising, breathing...
AQA A Level Biology复习笔记3.2.6 Ventilation & Gas Exchange
Ventilation & Gas Exchange Gas exchange in the lungs requires a concentration gradient Ventilation (mass flow of gases) in the lungs and the continuous flow of blood in the capillaries h...
AQA A Level Biology复习笔记3.2.5 The Alveolar Epithelium
The Alveolar Epithelium The exchange of oxygen and carbon dioxide occurs between the alveoli and the capillaries in the lungs Oxygen and carbon dioxide are exchanged in a process of simple d...
AQA A Level Biology复习笔记3.2.4 Three-way Taps
Apparatus & Techniques: Three-way Taps Three-way taps can be used in conjunction with potometers and respirometers They allow for repeat readings to be taken easily, eliminating the need...
AQA A Level Biology复习笔记3.2.3 Looking at the Gas Exchange under the Microscope
Apparatus & Techniques: Using an Optical Microscope Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists as they...
AQA A Level Biology复习笔记3.2.2 Dissecting the Gas Exchange System
Apparatus & Techniques: Dissection Dissections are a vital part of scientific research They allow for the internal structures of organs to be examined so that theories can be made about ...
AQA A Level Biology复习笔记3.1.6 Gas Exchange vs Water Loss
Compromises between Gas Exchange & Water Loss The exchange of gases from the atmosphere is essential for the survival of organisms Oxygen is required for respiration Carbon dioxide is re...
AQA A Level Biology复习笔记3.1.5 Adaptations of Gas Exchange Surfaces
Adaptations of Gas Exchange Surfaces Effective exchange surfaces in organisms have: A large surface area Short diffusion distance Concentration gradient (maintained) Across the Body S...
AQA A Level Biology复习笔记3.1.4 SA:V Ratio & Metabolic Rate
The Relationship between Surface Area: Volume Ratio & Metabolic Rate The metabolic rate of an organism is the amount of energy expended by that organism within a given period of time The...
