A Guide to Your Body's Body Systems

The Systems of your Body By: Nathan F.

The Digestive System

The Digestive system starts in your mouth, were some of your glands create saliva to start to break down the food you ate. Then the food takes it's time down your esophagus into your stomach. After that drama, strong muscles in your stomach break down, and mix the food with acid. This melts everything except the sugar, because it gives the energy to your body.

Then the journey through your small intestine starts! The food starts to travel through in a way known as peristalsis, which is the wavelike contraction of muscles in the small intestine that keep the food moving. The reason it keeps the food moving, because it rubs the food onto the sides of the intestine, which have some things called villi. These take the energy, that is being giving to them from the sugar.

The Circulatory System

The Circulatory System pumps your blood through your body. The blood gets the energy from the digestive system, as shown above, and transmits it around the body using this system. The walls of your blood veins are what gets the energy from the villi, and when a blood cell touches the wall, it's like the villi with food. Except the other way around. The cell gets the energy.

The only part of the Circulatory system I haven't talked about is your Heart. It uses strong muscles to pump your blood through your body, which is why it is at the near center of your body. An alternate to red cells, are the white cells. These fight infection, and mix with the red cells in the blood stream. Another thing to help with wounds is the platelets, these clot blood up in your wounds, which eventually dry and scab over. This allows the wound to heal.

The Respiratory System

Your lungs are the major part of this system. Since your body needs lots of energy, that energy comes from your cells, which guess what? Need oxygen. This is what your lungs do for your body. They pump oxygen into your blood stream, giving your blood cells oxygen. The oxygen is taken out of the air you breathe in by small air sacs called alveoli.

When you breathe in, tiny hairs in your noes filter the air, and in the back of your nose it heats the air. The warm air then travels down your trachea, or to put it to terms you probably know, your windpipe. The large things that branch off from the windpipe, are called your lungs, as you probably know. Or you should know. These contain your alveoli

The Skeletal System

Your skeletal system is made up of mainly bones, but also cartilage and ligaments. You have 206 bones in your body, they work together with your muscular system to make your body move, flex, and stretch. Without your bones, you'd be a blob on the floor! The areas were your bones bend are called joints, these are held together by ligaments, which are connective tissue.

Your skeletal system does more than you think it does! It holds your body together, and keeps you from just shambling around as that blob you'd be! But bones can't just do everything, they need your muscles to work. They work together really well, as you'll learn in about a second!

The Muscular System

This includes muscles and tendons, which help to move your body. As I told you above your bones also help, and need help from your muscles to move. The kind of muscle that supports and moves your body are called skeletal muscles, these are usually attached to bones. They are connected either directly, or by connective tissue called tendons.

Some other types of muscles are smooth muscles, which mostly make up the walls of important organs in your body. The other kind of muscle is called cardiac muscle, these are what makes up the walls of your heart. They are strong, mainly because they pump all your blood around your body. And when you think about that, they have to be pretty strong because your body is made up of about 60% water! That counts blood!

Look at the Other 2 Main Systems!

Click Here to see the Excretory system, and Nervous system!