skeletal system

The skeletal system The Skeletal System serves many important functions; it provides the shape and form for our bodies in addition to supporting, protecting, allowing bodily movement . The Skeleton is the name given to the collection of bones that holds the rest of our body up. Our skeleton is very important to us. It does three major jobs. 1. It protects our vital organs such as the brain, the heart and the lungs. 2. It gives us the shape that we have. Without our skeleton, we would just be a blob of blood and tissue on the floor. 3. It allows us to move. Because our muscles are attached to our bones, when our muscles move, they move the bones, and we move. When you were born, your skeleton had around 350 bones. By the time you become an adult, you will only have around 206 bones. This is because, as you grow, some of the bones join together to form one bone. Muscular system The human body contains more than 650 individual muscles which are attached to the skeleton, which provides the pulling power for us to move around. The main job of the muscular system is to provide movement for the body. The muscular system consists of three different types of muscle tissues: skeletal, cardiac, smooth. Each of these different tissues has the ability to contract, which then allows body movements and functions. There are two types of muscles in the system and they are the involuntary muscles, and the voluntary muscles. The muscle in which we are allow to control by ourselves are called the voluntary muscles and the ones we cant Control are the involuntary muscles. The heart, or the cardiac muscle, is an example of involuntary muscle. The Integumentary System The integumantary system contains the largest organ in the human body, the skin. It is also comprised of such extensions of the skin as hair and fingernails. The skin, however, is the most important of these. The skin protects and cushions the body's delicate organs. It also provides the body a physical barrier to keep out foreign materials and to prevent the body from drying out. The skin is made of three separate layers, each with its own particular function. The digestive system The digestive system is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. Inside this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food. Two solid organs, the liver and the pancreas, produce digestive juices that reach the intestine through small tubes. In addition, parts of other organ systems (for instance, nerves and blood) play a major role in the digestive system. When we eat such things as bread, meat, and vegetables, they are not in a form that the body can use as nourishment. Our food and drink must be changed into smaller molecules of nutrients before they can be absorbed into the blood and carried to cells throughout the body. Digestion is the process by which food and drink are broken down into their smallest parts so that the body can use them to build and nourish cells and to provide energy. Digestion involves the mixing of food, its movement through the digestive tract, and the chemical breakdown of the large molecules of food into smaller molecules. Digestion begins in the mouth, when we chew and swallow, and is completed in the small intestine. The chemical process varies somewhat for different kinds of food. The excretory system The excretory system is the system in the body that contains skin, lungs, kidneys, and their associated organs. Excretory System Functions Collect water and filter body fluids. Remove and concentrate waste products from body fluids and return other substances to body fluids as necessary for homeostasis. Eliminate excretory products from the body. Circulatory system On average, your body has about 5 liters of blood continually traveling through it by way of the circulatory system. The heart, thelungs, and the blood vessels work together to form the circle part of the circulatory system. The pumping of the heart forces the blood on its journey. What is the job of the Circulatory System? The Circulatory System is responsible for transporting materials throughout the entire body. It transports nutrients, water, and oxygen to your billions of body cells and carries away wastes such as carbon dioxide that body cells produce. It is an amazing highway that travels through your entire body connecting all your body cells. Parts of the Circulatory System the circulatory System is divided into three major parts: 1-The Heart 2-The Blood 3- the blood vessels