The skeletal system is primarily what gives our body structure. It also works with the muscular system to create movement. There is connective tissue in the bones. Bones are actually made up of connective tissue and minerals(calcium phosphate). There are also three types of material inside of a bone. First, there is compact bone. This is very hard and dense. Inside of that, there is the spongy bone. This provides the strength and support for the bone. Finally, there is bone marrow. There are two types of bone marrow: red and yellow. The red marrow produced red and white blood cells. The yellow marrow stores fat.
The skeletal system also works with many other body systems. It interacts with the muscular system because it works with it to produce movement . It also interacts with the circulatory system because the bone marrow is where red and white blood cells are made. Bone marrow is also very important to the immune system, so the skeletal system interacts with that system as well.
This video explains how the skeletal system interacts with other body systems, how it functions, and why it's important.