The glands of the endocrine system and the hormones they release affect almost every cell, organ, and function of our bodies.| kidshealth.org
We need the respiratory system for breathing. Find out how it works.| kidshealth.org
Without bones, muscles, and joints, we couldn't stand, walk, run, or even sit. The musculoskeletal system supports our bodies, protects our organs from injury, and enables movement.| kidshealth.org