How do muscle pairs work together to move body parts?
1 Answer
Skeletal muscle movement takes place by contraction. Muscles shorten during contraction, they can only pull, and they work in opposition.
Explanation:
Skeletal muscle movement takes place by contraction.
Muscles shorten during contraction. Muscles can only pull,
they never push.
Muscles work in opposition, one set of muscles contracts and pulls while another set of muscles relaxes.
The muscle set that creates the movement is referred to as the agonist. While the muscle that relaxes during movement is called the antagonist.
When the elbow is flexed the bicep shortens and pulls up on the ulna to reduce the angle between the ulna and the humerus.
When this happens the triceps relax to release the tension on the ulna. The biceps are the agonist and the triceps are the antagonist.
In order to extend the elbow the triceps shorten and pull on the ulna increasing the angle of the humerus and the ulna. The biceps relax during this movement. The triceps are now the agonist and biceps are now the antagonist.
Image from SMARTNotebook Lecture by @SMARTERTEACHER
For every muscle set, there is an agonist working in opposition with an antagonist, flexors to extensors, supinators to pronators, adductors to abductors.
Image from SMARTNotebook Lecture by @SMARTERTEACHER
