No the flexor closes the joint.
Triceps muscle is not a flexor. Triceps is an extensor of elbow joint. Biceps muscle is flexor.
Extensor muscles open a joint and are the opposite to flexor muscles, which close it. I imagine triceps are extensor, while biceps are flexor.
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Probably the Biceps Brachii (commonly called Biceps).
A flexor is a muscle that causes a joint to bend. In contrast, an extension is a muscle that straightens a joint.
Flexor
Any flexor muscle decreases the angle of a joint. When you flex your biceps brachii, the distance between your forearm and arm becomes closer together. When you use your extensors on the same joint, your arm will straighten.
Thie brachialis is a muscle in the arm of the upper limb and it is the primary flexor of the elbow joint.
flexor digitorum superficialis