Lec 9 - Reflex and Central Pattern Generators

Lec 9 - Reflex and Central Pattern Generators - Reflexive...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Reflexive and Rhythmic Movements Reflexive and Rhythmic Movements This pdf is enabled for commenting in Adobe Reader and the urls are active BIO334 - 2012 raig Evinger Craig Evinger Understanding How Muscle Properties Determine Understanding How Muscle Properties Determine Joint Movement Joint Movement Muscle force depends upon muscle length If you hold a muscle at a constant length ometric contraction and stimulate the motor ( isometric contraction ) and stimulate the motor nerve to produce tetanic fusion of the muscle, then the amount of force the muscle generates changes with muscle length (red line). From: http://www.unmc.edu/Physiology/Mann Understanding How Muscle Properties Determine Understanding How Muscle Properties Determine Joint Movement Joint Movement The amount of force a muscle can generate depends upon the overlap between actin and myosin in a sarcomere. With muscle stretched to eliminate overlap between actin and myosin, the Sarcomere muscle cannot generate any force (e). When the muscle length is so short that the actin filaments overlap and the Actin myosin begins to run into the z line (b), the muscle loses most of its ability to generate force. At resting muscle length, Myosin Z line (e) the overlap of myosin and actin is nearly complete and the muscle develops maximum contraction force (c). i f l t f l t Maximum force results from complete binding of all myosin heads to actin binding sites. This position occurs at muscles ptimal resting length Adapted from: http://www.colorado.edu/intphys/Class/IPHY3430- a muscle s optimal resting length . 200/image/length-tension.jpg Understanding How Muscle Properties Determine Understanding How Muscle Properties Determine Movement Around Joints Movement Around Joints The elastic (spring-like) properties of muscle also contribute to muscle force. If you hold a muscle at a constant length ometric contraction and stimulate the motor ( isometric contraction ) and stimulate the motor nerve to produce tetanic fusion of the muscle, then the amount of force the muscle generates changes with muscle length (red line). If you stretch the muscle without stimulating the nerve that innervates it, then muscle force increases with a hyperbolic-like pattern with muscle length (blue line). The difference between the forces generated at different lengths for passive and active muscles (dashed brown line) shows the force produced by actin myosin binding alone . From: http://www.unmc.edu/Physiology/Mann Understanding How Muscle Properties Determine Understanding How Muscle Properties Determine Movement Around Joints Movement Around Joints The elastic (spring-like) properties of muscles also contribute to the generation of force....
View Full Document

Page1 / 39

Lec 9 - Reflex and Central Pattern Generators - Reflexive...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online