EVERYDAY SCIENCE

Detailed explanation-1: -Healthy cartilage helps you move by allowing bones to glide over one another. It also protects bones by preventing them from rubbing against each other. Keeping your joints healthy will allow you to run, walk, jump, play sports, and do the other things you like to do.

Detailed explanation-2: -They need to be mobile enough to allow the muscles to do their job properly. If a joint is stiff there is less ability for the muscle to move the joint through its normal range of motion. The better the joint moves the better the effect the muscles will have.

Detailed explanation-3: -Ball-and-socket joints possess a rounded, ball-like end of one bone fitting into a cup-like socket of another bone. This organization allows the greatest range of motion, as all movement types are possible in all directions.

Detailed explanation-4: -Ball-and-socket joints, such as the shoulder and hip joints, allow backward, forward, sideways, and rotating movements. Hinge joints. Hinge joints, such as in the fingers, knees, elbows, and toes, allow only bending and straightening movements.