movement

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Cardiac muscles - heart muscles that have properties of skeletal and smooth muscles
The Control of Movement
The Control of Movement
Muscles are composed of many individual fibers. The fewer muscle e greater the precision of movement.
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The Control of Movement
重症肌无力,自身免疫疾病,乙酰胆碱受体抗体,神经肌肉接头 - 剩余的受体需要大量递质以触发肌肉收缩。 - 可导致进行性无力和骨骼肌肉的快速疲劳。
重症肌无力是一种主要累及神经肌肉接头突触后膜上乙酰胆碱受 体 (acetylcholine receptor,AchR)的自身免疫性疾病。
The Control of Movement
Fast-twitch fibers are anaerobic and use reactions that do not require oxygen, resulting in fatigue.
– Behaviors requiring quick movements utilize fasttwitch fibers.
Neural Basis of Behavior: Movement
The Control of Movement
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– The remaining receptors need maximum amount of transmitter in order to trigger muscle contraction.
– Causes the progressive weakness and rapid fatigue of the skeletal muscles.
Smooth muscles - control movements of internal organs e.g. the digestive system
Skeletal muscles/striated muscles - control movement of the body in relation to the environment.
A neuromuscular junction is a synapse where a motor neuron axon meets a muscle fiber. – In skeletal muscles, axons release acetylcholine which excite the muscle to contract.
Slow-twitch fibers are aerobic and require oxygen during movement and therefore do not fatigue.
– Non strenuous activities utilize slow-twitch and intermediate fibers.
A neuromuscular junction is a synapse where a motor neuron axon meets a muscle fiber. – In skeletal muscles, axons release acetylcholine which excite the muscle to contract.
The Control of Movement
Movement requires the alternating contraction of opposing sets of muscles called antagonistic muscles.
A flexor muscle is one that flexes or raises an appendage.
An extensor muscle is one that extends an appendage or straightens it.
The Control of Movement
Myasthenia gravis is an autoimmune disease in which the immune system forms antibodies that attack the acetylcholine receptors at neuromuscular junctions.
The Control of Movement
Muscles are composed of many individual fibers. The fewer muscle fibers an axon innervates, the greater the precision of movement.
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