The knee helps your leg flex and extend.
The bone itself cannot "bend" since it is a formed, hard tissue. But limbs (legs, arms), wrists, hands, fingers, ankles, parts of the feet, the toes, the neck and spine can "bend" or more accurately can flex or extend. Tendons and ligaments form attachments between places where bones meet, and extend into muscles that are on top of/surround the bones. Tendons and ligaments allow for stretching, bending, and straightening.
The phalanges are in the skeleton system. They are the bones at the tips of your fingers and toes. The phalanges in your fingers allow you to pick up things and generally just allow you to move your fingers, and the phalanges in your toes allow you to walk, balance and stay upright. They grip things. They are your fingers (and toes). Their main function is to be able to pick things up and put them down. And the function of the phalanges is to provide dexterity to the hand. To provide structure to your feet and hands. There are 3 phalanges (the proximal, middle, and distal phalanx) in most of the fingers and toes. However, the thumb and large toe have only two phalanges that accounts for their being shorter.You can flex or extend the fingers because of phalanges only. Importance of fingers can not be over emphasised.
The part of your finger that bends is called the joint, specifically the proximal and distal interphalangeal joints which allow the finger to flex and extend. These joints are made up of bones, ligaments, tendons, and synovial fluid that work together to enable movement.
When you flex your arm your biceps contract, and your triceps extend. And when you unflex your arm the triceps contract and you biceps extend. The muscles work together to allow you to move your body.
i done no
fixed joint
The radius and the ulna are the two bones that rotate over the wrist. The radius is the bone on the thumb side of the forearm, while the ulna is on the pinky side. They work together to allow the wrist to flex, extend, and rotate.
Both
The Biceps flex the elbow The Triceps extend the elbow
== == In the feet there are tarsal's, the metatarsal's and the phalanges. The tarsal's join the foot to the leg. They are in the ankle part of your foot. The metatarsal's are more in the foot not in the toes. If you rub your foot you can feel you metatarsal's. And also in your foot there is the phalanges which are more in your toes than your foot part. They are the bones in your toes and you can also feel them too. The question about how many bones in the hands have already been answered, and I think so has this, but it said it hadn't been answered on the other page.
You flex your muscles to do this and these pull on the tendons which link the muscles to the bones.