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Muscular System - Coggle Diagram
Muscular System
Neuromuscular Junction
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Step 3: Calcium entering causes the synaptic vesicles to release the acetylcholine that it's storing.
Step 6: Sodium ions enter the muscle fiber same time while potassium ions are released from the muscle fiber this causes the muscle membrane to become less negative
Step 2: Calcium channels open within the axon terminal, this allows the sarcoplasmic reticulum to go into the axon terminal
Step 7: Once the muscle membrane reaches a certain threshold value action potential spreads across the sarcolemma
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Sarcomere
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The M line is in the middle of the h zone and it consists of proteins that hold the myosin filaments together
Muscle Coverings
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aponeuroses is sometimes used in the body to connect muscles, it is a broad sheet of CT
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Major Functions
Skeletal muscles contract in order to move our body parts around, the muscles can only contract and pull. So the body has muscles that move in both directions like the bicep and tricep for example
Cardiac muscle is used to pump blood throughout out body at all times, this is why it is involuntary, it needs to be working 24/7/365
Smooth muscle maintains arteries diameter or closes it to restrict blood flow, it is pretty much used as the body's valves they are just like other muscles and can only contract and relax.
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Sliding Filament Theory
First the impulse arrives from the brain then acetylcholine is released along with calcium to attach to the troponin and move the tropomyosin out of the way to create binding sites. Then myosin heads can bind with the actin filaments to form a cross bridge. The myosin head cocks back and then moves forward using ATP. This pulls the filaments together and that is the contraction of the muscle.
Action potential
action potential is when a neuron sends information down an axon(away from the cell body) and it is basically a spike of electrical activity that is created in our body