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
The type of muscle that bends a joint is called a flexor muscle. Flexor muscles contract to decrease the angle between two bones at a joint, facilitating movements like bending the elbow or knee. These muscles work in opposition to extensor muscles, which increase the angle at a joint.
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.
A muscle that causes a joint to bend when it contracts is called a flexor. Flexor muscles, such as the biceps brachii in the upper arm, work by shortening and pulling on the bones to decrease the angle at a joint, facilitating movements like bending the elbow. In contrast, extensors are muscles that increase the angle at a joint.