Muscle cells are specialized for movement of the body. They have extra mitochondria so that they can utilize the energy necessary to contract muscles. A whole chain of muscle cells contracting will cause the muscle to "flex."
If you flex your muscles too much, you may experience muscle fatigue, soreness, and potential muscle strain or injury. It is important to allow your muscles time to rest and recover to prevent overuse injuries.
Muscles bend and flex by moving the arm to pick up an object or even weightlifting. you know lil Wayne
The primary antagonist of the brachialis muscle is the triceps brachii muscle. When the brachialis contracts to flex the elbow, the triceps relaxes to allow this movement.
When you flex a muscle, it puts pressure on the muscle fibers, causing microscopic damage. This damage triggers an inflammatory response, leading to pain and soreness in the muscle.
When you flex your bicep, the muscle contracts and pulls on the tendons that attach it to your bones. If there is inflammation or strain in the muscle or tendon, it can cause pain when you flex your bicep.
supraspinatus muscle
The triceps brachii muscle does not flex the elbow; it is responsible for extending the elbow joint when it contracts.
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The stenrocleidomastoid muscle bilaterally does neck extension, while unilaterally, they laterally flex the Neck to the same side of the muscle contracting, and rotates th neck to the contra lateral side. So if you rotate to the left, the right sternocleidomastoid muscle is working. The right stenrocleidomastoid will also cause right lateral flexion( side bending)
The coracobrachialis muscle acts as a third-class lever in the body. It helps flex and adduct the arm at the shoulder joint by pulling on the coracoid process of the scapula when contracting.