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ch.7 Muscular System
| Question | Answer |
|---|---|
| 3 types of Muscle | Skeletal, Visceral, Cardiac skeletal has 600 muscles 40% of body weight |
| Excitabiltiy | ability to recieve and respond to a stimuslus from the nervous system |
| Contractility | ability to shorten or contract |
| Contractility has 4 important function | movement, posture, joint stability, heat production |
| Extensibility | muscle can be stretched or extended |
| Elasticity | capacity to recoil or return to its orginal shape |
| 3 skeletal muscle attachments | direct, indirect: tendons (aponeurosis), fixed end |
| aponeurosis | broad flat sheetlike |
| tendons | thick rope like |
| name the 2 stimulus for contraction | motor neurons, motor unit |
| motor neurons | special nerve cell that stimulates contraction |
| motor units | single motor neuron and all the muscle fibers it stimulates comprise |
| what are the 3 contractions of the whole muscle | muscle tone, insontonic contraction, isometric contraction |
| Muscle tone (tonus) | muscle unit takes turns contracting and relaxing. (continued state of partial contraction that is present in muscles) |
| Isontonic contraction | tension is constant/Same but the length of the muscle changes |
| Isometric contraction | tension in muscle increases but there is little to no movement |
| name the 3 movements produced by skeletal muscle | agonist, synergist, antagonist |
| agonist | prime mover |
| synergist | works with prime mover to cause movement |
| antagonist | muscles that oppse a particular movement |
Created by:
AshleyRenay
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