AQA A Level Biology复习笔记6.4.2 Negative Feedback
Negative Feedback The majority of homeostatic control mechanisms in organisms use negative feedback to maintain homeostatic balance (ie. to keep certain physiological factors, such as blood ...
AQA A Level Biology复习笔记6.3.6 Investigating Muscle Fatigue
Investigating Muscle Fatigue Prolonged or sustained exercise requires the repeated contraction of muscles Over time this can cause muscles to fatigue so they are no longer able to contract a...
AQA A Level Biology复习笔记6.3.5 Slow & Fast Skeletal Muscles
Slow & Fast Skeletal Muscle Fibres There are two types of muscle fibres found in muscles Fast fibres Slow fibres Human muscles are made up of both types of muscle fibres Some musc...
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...
