your triceps
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.
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The muscle that causes a joint to straighten when it contracts is called an extensor. Extensors work by increasing the angle between the bones at a joint, allowing for actions such as straightening the arm or leg. For example, the triceps muscle is an extensor that straightens the elbow joint when it contracts.
This type of muscle contracts to bend a limb at a joint
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.
A flexor is a muscle that causes a joint to bend. In contrast, an extension is a muscle that straightens a joint.
ligament
depends on which muscle but the opposite muscle sometimes contracts aswell to stabalize the joint some relaxes ...
Tricep.
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The triceps brachii muscle does not flex the elbow; it is responsible for extending the elbow joint when it contracts.