EHS 230 Lecture Notes - Lecture 1: Motor Unit, Sliding Filament Theory, Perimysium
19 Jun 2018
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Lecture 1
Muscle attachment locations
Origin- proximal bone attachment
- Close to the body
- Ex. The arm’s origin is attached to the shoulder
Insertion- away from body’s center
- Ex. The arm’s insertion is the joint between the arm and the hand
Type 1
- These fibers are used for slow exercises
Ex. Jogging and walking
- They are red and use oxygen to function
- They do not get tired are easily as type 2 fiber
-due to large amount of aerobic use (oxygen)
Neuromuscular junction
- Located between motor neuron and muscle fibers
- 1 motor neuron controls many muscle fibers
-1 muscle fiber has a different junction
- Allow muscles to contract if the actin and myosin are stimulated
Motor unit- it is a motor neuron and includes the fibers that it controls
Myofibrils- many myofibrils are located in one muscle fiber
Single fibrils do not have a neuromuscular junction
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Document Summary
The arm"s origin is attached to the shoulder. The arm"s insertion is the joint between the arm and the hand. They are red and use oxygen to function. They do not get tired are easily as type 2 fiber. Due to large amount of aerobic use (oxygen) Allow muscles to contract if the actin and myosin are stimulated. Motor unit- it is a motor neuron and includes the fibers that it controls. Myofibrils- many myofibrils are located in one muscle fiber. Single fibrils do not have a neuromuscular junction. They depend on electricity to transport a stimulus from one location to the next. Actin and myosin- these are contractile parts of myofibrils. Runs along with tendons, that are attached to exterior bone layer. Runs with sarcolemma ( exterior layer of muscle fiber) Muscle contraction depends on all these structures to successfully move and increase bone strength. When the impulse gets to the neuromuscular junction, it causes a reaction.
