AQA A Level Biology复习笔记6.2.7 Cholinergic Synapses
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 ...
AQA A Level Biology复习笔记6.2.6 Maths Skill: Calculating Maximum Impulse Frequency
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...
AQA A Level Biology复习笔记6.2.5 Speed of Conduction of Impulses
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...
AQA A Level Biology复习笔记6.2.4 The Refractory Period
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...
AQA A Level Biology复习笔记6.2.3 Nerve Impulses
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...
AQA A Level Biology复习笔记6.2.2 Resting Potentials
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...
AQA A Level Biology复习笔记6.1.14 Calculating Cardiac Output
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...
AQA A Level Biology复习笔记6.1.13 The Autonomic Nervous System
The Autonomic Nervous System There are several circumstances that can cause an individual's heart rate to increase, such as during exercise The brain is involved in this response of the hear...
AQA A Level Biology复习笔记6.1.12 Investigating Variables that Affect Heart Rate
Investigating Variables that Affect Heart Rate There are a wide range of factors that influence the heart rate of an organism Experiments can be designed to investigate the effect of a named...
