Muscles & tissue - Muscles Muscle Tissue Skeletal...

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Muscles & Muscle Tissue Skeletal Cardiac Smooth Functions of the Muscular System Movement o Converting chemical energy into mechanical energy to generate force Allows movement to take place o Skeletal : Locomotion Ability to move around as a biped or manipulation o What we are doing with our upper extremity manipulating the environment Communication The ability for us to do verbal and non verbal communication o Relies on skeletal muscle contraction ex: facial expressions o Cardiac : Atrial and ventricular contraction Cardiac muscles found in the heart are responsible for having the atrium and ventricles contract o To either propel blood into the Pulmonary circuit (lungs) Or systemic circuit (rest of the body) o Smooth : propulsion, peristalsis, etc. Propulsion Ability for blood vessels to have their smooth muscle contract and propel blood through blood vessels Peristalsis Moving a bolus of food through the digestive system o Contraction of the smooth muscle of the digestive system peristalsis Maintenance of Posture o Only Skeletal muscle contribute to the ability of us being upright The contractility and alternations of contractility of posture muscles that allows us to maintain upright
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Joint Stabilization 1. Fit of the bones 2. The capsule the ligaments 3. The muscle crossing that joint Skeletal muscle Tone of the muscle crossing that joint contributes to the stability of that joint o Don’t maintain tone of muscles you will have joint problems In terms of instabilities Control of Body Openings/Passages o Orbicularis oris/ocula o Sphincter (circular) muscles Allow you to open and close your mouth/eyes Ex. Anal sphincters o Skeletal muscles control body openings and passage ways But there is some smooth muscle contributes to this function (in very specific systems) Heat Generation o If you convert chemical form of energy into mechanical form of energy in muscle In splitting of ATP you give off heat ALL Muscles generate heat o Skeletal is the most abundant Therefore responsible for creating the most heat in the body Introduction to Muscle Muscles primarily help us accomplishment movement o Movement is a fundamental characteristic of all living things Muscle cells are capable of converting the chemical energy of ATP into mechanical energy Physiology of skeletal muscle o basis of warm-up, quickness, strength, endurance and fatigue Unique Features of Muscle Excitability (excitable tissue, found in nerfucs system too)/Responsiveness o Receive a stimuli, conduct a signal, propagation of that signal along muscle cell Polarized membrane to be able to do that = excitable tissue
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o Ionic charge changes/electrical impulse along the sarcolemma o Conductivity can generate a mechanical force Contractility (can generate force) o Ability to shorten forcibly Mechanical force generated Extensibility o
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  • Fall '13
  • Schager

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