Nervous System: Response to a Stimulus The nervous system enables the body to detect changes in the environment and brings about appropriate responses to ensure its safety Receptor cells detect cha...
Neurones: Structure & Function Neurones are specialised cells of the nervous system which carry electrical impulses around the body A bundle of neurones is known as a nerve There are different ...
Co-ordination of Response Organisms must respond to changes in their external and internal environments in order to survive Organisms need to Find favourable external conditions e.g. avoiding locat...
Modern Medicine & Participation in Sports Keyhole surgery Sports injuries are a common occurrence since the body is placed under stress when participating in sporting activities Some of these i...
Intensity of Exercise Effects of too little exercise on health Exercise is an important part of a healthy lifestyle Not doing enough exercise can have a detrimental effect on the health of an indiv...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：3.2.3 Catalysts Catalysts & Rates Catalysts are substances which speed up the rate of a reaction without themselves being altered or con...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：3.2.2 Explaining Rates Explaining Rates Increasing the number of successful collisions means that a greater proportion of reactant particles...
Practical: Investigating the Effects of Exercise Measuring breathing There are four main ways that breathing can be scientifically measured. These include: Tidal volume - this is the volume of air ...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：3.2.1 Measuring Rates Measuring Rates You should be able to describe experiments to investigate the effect of surface area, concentration, t...
