BIOL 103 Chapter Notes - Chapter 43: Nociceptor, Electromagnetic Spectrum, Thermoreceptor
27 Sep 2013
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Document Summary
Skeletal muscle has a variety of functions locomotion, stretching, chewing, breathing, maintaining balance. Muscle fibres are classified based on their rates of shortening and the way they produce atp for contraction. Skeletal muscle fibres are adapted for different types of movement. Fast fibres contain myosin with high atpase activity and is 4x faster at cross-bridge cycling than slow fibres, but the maximal force produced is the same. Slow fibres contain myosin with low atpase activity. Oxidative fibres are fibres with numerous mitochondria and have a high capacity for oxidative phosphorylation, so they rely on many small blood vessels to deliver oxygen. They can also contain myoglobin, an oxygen-binding protein which provides an intracellular reservoir of oxygen, which gives these fibres a dark red colour: oxidative fibres are often called red muscle fibres. Glycolytic fibres have few mitochondria but possess a high concentration of glycolytic enzymes and large stores of glycogen.
