What is present in the ball-and-socket joint to reduce friction?

Elbow joint is an example of

Which part of the body is affected by inflammation in the disease $Arthritis$?

An athlete while running fell on the track. She used her hands to sustain minimal injury. In the process,her hands received the maximum blow on the joints. Which combination of joints would be badly affected in this accident?

The joint of the wrist is of which type?

In rabbits,the ends of long bones are connected to one another by: