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...
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...
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...
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 ...
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...
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 ...
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...
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...
Edexcel IGCSE Biology 复习笔记 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...
