Bones
Bones are very strong, they are able to support our entire weight even though they are light. The largest bone in the human body is the femur or the thigh bone. We develope bones before our birth. At first it is cartilage, but a few weeks after birth ossification starts to develope. Our bones become stronger and our cartilage is replaced with stretchy collagen and calcium phosphate. It takes about twenty years for our bones to complete growth. In total the human body has two hundred-six bones. Young children and teenagers have not yet completed the growth of bones. They have "growing zones" also known as growth plates. The cartilage consists of many columns to perform a task as follow: a) to expand in lenght b) become stronger c) become mineralized. The bone has five main tasks to perform. They include providing support for the body, producing blood cells, storing minerals and lipids, providing leverage and movement, and protecting the body organs.
Muscles
Muscles provide movement for the human body. There are approximetly 650 muscles and 187 joints in the human body and they are attached to the bones. Each muscle is made up of tendons, blood vessels, nerves and skeletal muscle tissue. Muscles are very important, they "turn energy into motion". Whenever we express our emotion, idea etc, we are using the muscles of our larynx, mouth, tongue etc. Also, when we use our skeletal muscles we are communicating with body language. Muscles are highly sophisticated, they are able to grow stronger in time and training, heal strained or pulled muscles, and are incredibly efficient towards turning food or nutrients into energy or motion. There are also unique kinds of muscles that people do not notice. Usually, people look at physical shape (skeletal muscle) in muscle like the bicep. But we also have small interior muscles such as the heart when it pumps blood.