By Simran Jayasinghe
The Muscular System is made up of muscles. There are two main types of muscles, voluntary muscles, and involuntarily muscles. There are also Skeletal muscles, Smooth muscles, and Cardiac muscles. Smooth Muscles are like the muscled that line the inside of your stomach. Cardiac and Smooth muscles are involuntary. Involuntary means that do things without you having to think about it. Voluntary means you need to think about it to do it. Skeletal Muscles are voluntary because you think before you move and your brain has to tell your muscles to move. Bones and muscles have to work together to allow you to move.
The skeletal system is made out of our bones and our cartilage. Cartilage is tissue that’s flexible, like the cartilage in our noses. Some main type of bones are ribs, femurs, pelvis, and fibula. The place where two or more bones meet are called joints. Some types of joints are pivot joints, gliding joints, hinge joints and ball-and-socket joints. Your knee is a ball-and-socket joint. A pivot joint, for example, is found in the neck. If we didn’t have bones, we would be a lump of cartilage, skin, and organs. Bones are what make up our structure and shape. Our bones also allow us to move. If we didn’t have bones, we would have to stay still our whole lives! That would be pretty boring! They also protect some of your organs.Your ribs, for example, protects your lungs and heart. Strings of tissues that hold our bones together are called ligaments. Ligaments also help to keep us moving.