Question

Old people often complain of stiff joints and joint pains. What do you think could be the possible reasons for this?

Answer 1

Some joints like the shoulder joint and knee joints need to be held firmly in position and well lubricated such bones usually have lubricating fluid known as synovial fluid which acts as a cushion and removes friction between the joints. As we age the joints become stiffer and we feel pain because the amount of synovial fluid decreases and cartilage become thinner making the joints feel stiff.

I have given your answer so please mark me brainliest