The Human Body System

By: Ava S.


The Human body has many things working in it constantly. The three systems in our body are the Circulatory, Respiratory, and Digestive System. Each system is important for our body. Our body can be resembled to a castle of cards. If one part doesn't work right the slightest bit, everything will fall apart. Everything works together to keep our body alive and healthy.

The Circulatory System

The circulatory system moves as a transportation system to move food, nutrients, and oxygen to each cell and take away cell waste. The circulatory System includes the heart, arteries, capillaries, and veins. The heart pumps blood through two sides. The right side pumps blood to the lungs. The lungs get oxygen from the blood and then gives up carbon dioxide. The blood then flows to the left side of the heart were it pumps blood through the arteries to the body.

Respiratory System

The Respiratory System is in charge of your breathing. The Respiratory System breathes in oxygen and exhales carbon dioxide. In this system, there are 7 parts- Lungs, sinus cavity, trachea, bronchial, air sacs, and the diaphragm. First, the Respiratory System breathes in oxygen. It then goes into your larynx and into to your trachea witch split into two parts, the left side of your lunge and the right side of your lung. After it enters your trachea and the two sides of your lungs, it splits off into bronchi and bronchial tubes. Then, the oxygen goes into the tiny air sacs- or alveoli- where the blood picks up the oxygen and brings it to each cell in your body. There is also another important part of your respiratory system, your nasal passage. When there is dust particles or dirt in the air, your snot raps around the dust and dries to make boogers! I know what your thinking- disgusting- but it's the truth.

The Digestive System

Have you ever eaten a cheese burger and wondered how the nutrients gets to your cells. I can tell you this, if you see the shape of a cheese burger floating through your skin to get to your cells, something is very wrong with your digestive system. The digestive system is responsible for breaking down food so that nutrients can be carried to the blood to each cell in your body. With that being said, you will never, ever, see a giant cheese burger floating through your body because the digestive system breaks down all of the food that you eat. There are 9 parts in the digestive system- teeth, tongue, epiglottis, esophagus, stomach, small intestines, large intestines, and your colon. So when you eat a cheese burger , your tongue and your teeth chew the cheese burger until it's mushy. It will then go down your epiglottis and your esophagus and into your stomach. When that food is in your stomach, the fluids will break that food even more. Then, the food that you just ate will go into your small intestines where your body absorbs nutrients and puts them into your blood. After it goes through your small intestines, it will enter your large intestines also known as your colon. The colon will then take water out of the waste. Once your colon takes the water out of the waste, the waste from your food will exit your body. So next time you eat a hamburger, think of your digestive system.


As you can see, your body is an amazing thing to study. If one of your body parts didn't work together, everything wouldn't work right. The circulatory system, respiratory system, and digestive system all work together for your body to stay healthy and to keep you alive.