Synovial joints is humans are characterized by
a)	Joining of two bones	b)	Presence of fluid filled synovial cavity
c)	Rare movement	d)	No movement at all

(b)

Synovial Joints Those joints are the perfect joints which allows free movements in one or more directions. Synovial joints are of different types depending upon the nature of articulation and degree of movement. Bones end bear synovial membranes and enclose a cushion of synovial fluid.

Synovial fluid lubricates the joints to allow nearly frictionless movement of bones on each other and nourishes the structures participating in the joints. It also serves to keep the bones held together like a film of water between the two glass plates does