EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：4.1.1 Organic Compounds Representing Organic Compounds Introduction Organic Chemistry is the scientific study of the structure, properties, ...
Detection of Light The eye is a sense organ containing receptors sensitive to light intensity and wavelength Receptors are specialised cells that can generate an electrical impulse in a sensory neu...
2022年AMC12A卷中国区考试于11月11日（周五）正式结束，考试结束后，很多同学反映今年的试题难度增加，有些同学则认为难度与去年持平，但由于每个人的水平不一样，对试题难度的感知带有自己的主观性，不可一概而...
Synapses: Structure & Function Structures known as synapses are found at the junctions between cells in the nervous system e.g. In the sense organs there are synapses between sensory receptor c...
Transmission of Nerve Impulses Neurones transmit electrical impulses which travel along the neurone cell surface membrane from one end of a neurone to the other Note that an impulse is not an elect...
3.2.5 Practical: Effect of Catalysts on Rate of Reaction Practical: Effect of Catalysts on Rate of Reaction Aim: To investigate the effect of different solids on the catalytic decomposition ...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：3.2.4 Practical: Effect of Surface Area on Rate of Reaction Practical: Effect of Surface Area on Rate of Reaction Aim: To investigate the effect of...
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...
