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Muscular System (Body movements (Flexion-movement that decreases angle of…
Muscular System
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Thigh & hip
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quadricep group- All extend knee, rectus femurs also flexes hip on thigh
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Arm
Bicep brachii-flexes elbow, flexes and abducts shoulder
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types of muscle tissue
skeletal-cells are long, cylindrical, parallel, and multinucleated. Striated and voluntary.
Cardiac-cells are long, cylindrical, branched, has single central nucleus. Has striations and is involuntary.
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Muscle Contraction
- Nerve impulse reaches synaptic end bulbs and causes synaptic vesicles to fuse with neurolemma and release ach
- Ach diffuses across synaptic cleft, and binds with receptors on motor end plate of the muscle cell
- This causes receptor to change shape, and opens Na+ channels in sarcolemma.
- Electrical current is generated and is carried along sarcolemma, causes action potential muscle contraction.