Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.5.9 Humans: Digestive Enzymes The Role of Digestive Enzymes The purpose of digestion is to?break down large, insoluble molecules?into?smaller, soluble molecu...
Cholinergic Synapses Where two neurones meet, they do not actually come into physical contact with each other – a very small gap, known as the?synaptic cleft, separates them The ends of the ...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.5.8 Humans: The Digestive System The Structure & Function of the Alimentary Canal The digestive system is an example of an?organ system?in which several ...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.5.7 Humans: Balanced Diet The Importance of a Balanced Diet A?balanced diet?consists of all of the food groups in the?correct proportions The necessar...
Calculating the Maximum Frequency of Impulse Conduction After an action potential passes through a section of an axon it undergoes a?period of recovery?and is?unresponsive This is known as t...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.5.6 Practical: Investigating Chlorophyll & Photosynthesis Practical: Investigating Chlorophyll and Photosynthesis Starch is stored in chloroplasts where ...
Factors that Affect the Speed of Conduction The?speed of conduction?of an impulse refers to?how quickly the impulse is transmitted?along a neurone It is determined by multiple factors: The?p...
The Refractory Period Very shortly (about 1 ms)?after an action potential?has been generated in a section of the axon membrane, all the?sodium ion voltage-gated channel proteins in this sect...
Action Potentials Neurones?transmit?electrical impulses, which travel extremely quickly along the neurone?cell surface membrane?from one end of the neurone to the other Unlike a normal elect...
Resting Potentials Neurones?transmit?electrical impulses, which travel extremely quickly along the neurone?cell surface membrane?from one end of the neurone to the other In a?resting axon?(o...
Calculating Cardiac Output Cardiac output?(CO) is the term used to describe the volume of blood that is pumped by the heart (the left and right ventricle) per unit of time An average adult h...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.5.5 Practical: Investigating Carbon Dioxide & Photosynthesis Practical: Investigating Carbon Dioxide & Photosynthesis The?iodine test for starch?can ...
