Chapter 5 - ventricle of the heart Skeletal Muscle •...

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Chapter: 5 Muscular System Functions of the skeletal muscles: Support the body Stable body temperature Protect internal organs Stabilize Joints Functions of smooth muscles: Smooth muscles controls slow involuntary movements such as contraction of smooth  muscle in the walls of the stomach and intestines The muscle of the arteries contracts and relaxes to regulate the plod pressure and the  flow of blood. Cardiac Muscles and Functions: Present only in the heart Cells are striated and branching Ends of cells are joined by communication junctions Cardiac muscle  tissue plays the most important role in the contraction of the atria and 
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Unformatted text preview: ventricle of the heart Skeletal Muscle: • Muscle Fiber, is actually a cell. Plasma membrane = sarcolemma, cytoplasm = sarcoplasm, endoplasmic reticulum = sarcoplasmic reticulum, t-tubules. • A muscle is made up of muscle cells, muscle fiber is a single muscle cell, each fuber contains many myofibrils • Myofibril, muscle fibre has many myofibrils • Myosin – thick filament, composed of several hundred molecules of the protein myosin, each myosin molecule is shaped like a golf club. •...
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Chapter 5 - ventricle of the heart Skeletal Muscle •...

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