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Tyinmuscrolestogther
Tying roles of muscles all together
| Question | Answer |
|---|---|
| Muscles with multiple agonist actions | attempt to perform all of their actions when contracting cannont determine which actions are appropriate for the task at hand |
| PERFORMED actions depend on several factors: | Motor units activated joint position muscle length relative contraction or relaxation of other muscles acting on the joint |
| Two synergist muscles may | counteract their opposing actions to accomplish a common task |
| Example of two synergist muscles counteracting opposing actions | Kicking a ball: Agonist muscles are primarily responsible for hip & knee flex/ext. Hamstrings are antagonistic and relax to allow kick Preciseness of kick depends on the involvement of many other muscles... |
| Continued... | Lower extremity route and subsequent angle at the point of contact depend upon a certain amount of relative contraction or relaxation in hip abductors, adductors, internal rotators, external rotators (acting in synergistic fash to for preciseness |
| Continued... | Synergistic muscles in contralateral hip and pelvic area must be under relative T to help fixate or stabilize the pelvis on that side to provide a relatively stable base for the hip Ex: Pectineus & Tensor Fascia Latae are add/abd in addition to flexors |
| Continued... | Abduction and Adduction neutralize each other Common action of the two muscles results in hip flexion (by the hip flexors which are stablized because of the latter discussed) |
| Antagonistic muscles produce | Actions opposite to those of the antogonist: Elbow extensors--Elbow flexors Elbow mvmnt in returning to hanging position after chinning is extension, but triceps and anconeus are not being contracted. Elbow flexors contract conc. followed by ecc. |
| Specific exercise are needed for | Each antagonistic muscle group |
| Reversal of Muscle Function | A muscle group described to perform a given function can contract to control the exact opposite motion. |
| When a particular muscle contracts | it tend to pull both of its ends towards the gaster. If neither of the bones to which a muscle is attached are stabilized then the two bones move toward each other upon contraction. More common: one bone is more stable and less stable bone moves toward it |
Created by:
jmgibson1
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