AQA A Level Biology复习笔记6.3.4 Muscular Contraction
The Sliding Filament Model Structure of thick & thin filaments in a myofibril The?thick filaments?within a myofibril are made up of?myosin molecules These are?fibrous protein molecules?w...
AQA A Level Biology复习笔记6.3.3 Examining Skeletal Muscle Under a Microscope
Examining Skeletal Muscle Under a Microscope Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists as they allow for ...
AQA A Level Biology复习笔记6.3.2 The Structure of Skeletal Muscle
Ultrastructure of Striated Muscle Striated muscle?makes up the muscles in the body that are attached to the skeleton Striated muscle is made up of?muscle fibres A muscle fibre is a?highly sp...
AQA A Level Biology复习笔记6.2.10 Neuromuscular Junctions
Transmission Across a Neuromuscular Junction Striated muscle?contracts?when it receives an?impulse?from a?motor neurone?via the?neuromuscular junction Neuromuscular junctions work in a very ...
AQA A Level Biology复习笔记6.2.9 Drug Effects on Synapses
Predicting the Effects of Drugs on a Synapse Chemical or?drugs?can have a major impact on the functioning of the brain and nervous system Some prescription drugs can have a?beneficial effect...
AQA A Level Biology复习笔记6.2.8 Transmission Across a Cholinergic Synapse
Transmission Across a Cholinergic Synapse There are over 40 different known neurotransmitters One of the key neurotransmitters used throughout the nervous system is?acetylcholine?(ACh) Synap...
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...
