Flexion is the act of bringing two bones closer together, decreasing the angle between the two bones.
Extension is the act of increasing the angle between two bones, resulting in a straightening motion.
When you straighten your arm or leg (as in a pushing movement), you EXTEND the arm or leg. When you bend your arm at the elbow or your leg at the knee, you FLEX the arm at the elbow and flex the leg at the knee.
The muscles responsible for flexing and extending your lower leg are the quadriceps and hamstrings, while the muscles responsible for flexing and extending your upper arms are the biceps and triceps, respectively. These muscle groups work in opposition to each other to facilitate these movements.
You primarily use your elbow joint to lift the barbell, as it is responsible for flexing and extending your arm. Your shoulder joint also plays a supporting role by stabilizing and assisting in the movement.
triceps
Triceps and Biceps
By extending one's elbow, you can make a straight angle.
The triceps are the the large muscle at the back of the upper arm.
Biceps. Brachhil
Muscles within the brachium are responsible for the extension of the elbow. These muscles also work for the flexing of the arm as well.
Ulna .
The triceps brachii muscle does not flex the elbow; it is responsible for extending the elbow joint when it contracts.
There are many differneces between an elbow and an oboe. First, one is a joint and the other has three joints. Aside from that the elbow is a body part, where as the Oboe is a musical instrument.