There is (mainly, in terms of movement) a ball-and-socket joint in the shoulder; a hinge joint in the elbow; and various joints inside the wrist which work together at different bones.
fixed joint
the solar system of your mama
The knee helps your leg flex and extend.
The hamstrings flex the knee and extend the hip.
One set to flex a joint, the other to extend a joint.
A chicken's wing has muscles that control the movement of the elbow joint. These muscles contract and relax to move the wing up and down, allowing for flight and other wing-related activities. The tendons in the wing help transmit the force generated by the muscles to the bones, enabling movement at the elbow joint.
The Biceps flex the elbow The Triceps extend the elbow
Quadriceps contracts to extend the knee joint. Rectus femoris, the part of quadriceps flex the hip joint on the thigh.
The joint that allows you to move your heel is the subtalar joint, located between the talus and calcaneus bones in the foot. This joint enables the foot to perform inversion and eversion movements, which are essential for walking and balancing. Additionally, the ankle joint (talocrural joint) also contributes to heel movement by allowing the foot to flex and extend. Together, these joints facilitate various movements of the heel and foot.
The quadriceps femoris group extends the leg at the knee joint. It is responsible for straightening the knee and kicking movements.
Biceps flex the arm at the elbow, and triceps (along with the brachialis) extend it. The deltoids raise the arms.
A hinge joint primarily allows for flexion and extension movements. In the foot and leg, this type of joint is exemplified by the knee, enabling the leg to bend (flex) and straighten (extend). This motion is essential for activities such as walking, running, and jumping. Additionally, the ankle joint, which also allows some hinge-like movement, facilitates the up-and-down motion of the foot.