joints

a joint is a place where two or more bones meet

pivot joints:

allows rotation

a bone is shaped like a cylinder which rotates inside another bone

in the wrist elbow and neck

in the neck the first 2 vertebrae(atlas+axis) form a pivot joint that connects the skull and spine

this joint allows you to rotate your neck 

hinge joints:

allows extension and flexion

knee-tibia is joined to the femur

leg can be flexed and extended

eg squats or footballer straightens leg to kick a ball

elbow-humerus joined to ulna

arm can be flexed and extended

eg bicep curls

biceps allow flexion and triceps allow extension

ankle-hinge joint allows dorsi…