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The agonists are the muscles that help you to do this exercise. The antagonists are the muscles that bring you back to a regular position instead of being stuck.
Deltoid
in the arm: bicep contracts (agonist) triceps relax (antagonist) in the leg: hamstrings contract (agonist) quadriceps relaxes (antagonist) remember the agonist is the muscle "agonising" to do the work - like pulling the joint.
Rectus abdominis is the prime agonist and the superior and inferior oblique muscles are synergists. Erector spinae is an antagonist including a number of other muscles of the back.
Any time you are doing an exercise where you are pushing a secondary mover will be be the tricep. An antagonist when doing a pushing exercise will always be the bicep.
the agonist of the muscle is a motion that contracts the body to move in its opposition the antagonist is the muscle that causes movement of the posterior and anterior terms of the human body.
Agonist works with the muscles, and the antagonist is the muscle working against it in a contraction. i.e. Bicep curl, the agonist is the Biceps brachii and the antagonist muscle is the triceps brachii.The word agonist means "producing an action" - an antagonist opposes that action. In medicine, an agonist binds to a receptor site and causes a response, often imitating the natural body reaction. An antagonist acts against this drug and blocks the response. for examples ramiels small balls and pubic hair
You have gastrocnemius and soleus muscles on the back of the leg. They have common insertion in the form of tendocalcaneus. On the front side you have muscles of peroneal compartment to antagonize the calf muscles.
Muscles cannot push, they can only pull which means they work in pairs in order to move, this is known as antagonistic pairs. For example with a bicep curl you have the agonist/ prime mover (Bicep) and the antagonist/ Opposing muscle group (Triceps). As the agonist contracts it pulls the antagonist which relaxes.
One is the agonist and the other is called the antagonist. Agonist: muscle which is the main mover, it contracts and shortens Antagonist: muscle that lengthens and controls e.g. flexion at the elbow: the biceps are the agonist and the triceps are the antagonist.
there are upto four functional groups of muscles acting on joints. 1 agonist: actively contract to make a movement. muscle length reduces. 2. antagonist: resists the muscle on opposite side, thereby controls the speed of the agonist muscle contraction. that's why they say both agonist and antagonist muscles are working in pairs. furthermore when the movement is reversed the original agonist becomes the antagonist and the original antogonist becomes the agonist. hence antagonist pairs. right? 3. stabilisers: some muscles will hold the joint area stable while other three types of muscles are making a movement. 4. modifiers: some muscles can slightly change the direction of force exerted by agonists dynamically.
This is not possible. The spinal cord is wired so that when an extensor muscle contracts, a flexor muscle must relax. It is not possible to contract antagonizing muscle groups at the same time.