looking at the arms, it's the triceps and some portions of the deltoid.
There are many arm muscles. The triceps (on the back of your upper-arm) contract when you straighten your arm, and the biceps (the front of the upper-arm) relaxes.
no it isnt because the arm is bent by the flexor muscles (mostly just the biceps), and straightened by the extensor muscles (ie. the triceps).
The triceps muscles extend (straighten) the arm, while the biceps muscles flex (bend) it at the elbow joint.
our arm muscles ar abl to contract or move
The muscle that causes a joint to straighten when it contracts are the extensor muscles. These include the triceps that work with the biceps to extend the arm.
The muscles in your arm never expand; so when you bend your arm, your biceps contract as your triceps return to their regular form. When you extend your arm, you triceps contract as your biceps return to their regular form.
what happen to the bleeps when you straighten your arm
After a bicep workout, your muscles may feel tight and sore, making it difficult to fully straighten your arm. This is due to the stress and strain placed on the bicep muscles during the workout, leading to temporary muscle fatigue and tightness. Stretching and rest can help alleviate this discomfort.
Doms, or delayed onset muscle soreness, occurs when muscles are overworked or strained. When a muscle is sore, it may be difficult to fully straighten the arm due to inflammation and muscle tightness. This can limit the range of motion and make it uncomfortable to fully extend the arm.
Muscles can contract and shorten
Well remember that the musleoves the bone one way and that one way is the bent
Two muscles are needed, one to extend the other to close