{
  "id": "muscular",
  "name": "Muscular system",
  "function": "Produces movement, maintains posture, and generates body heat.",
  "key_organs": [
    "Skeletal muscles",
    "Smooth muscle",
    "Cardiac muscle",
    "Tendons"
  ],
  "url": "https://gratisapi.com/api/body-systems/muscular"
}