The Circulatory System moves nutrients to the cells of the body to feed them and help them fight disease. The main parts of the Circulatory System are the heart, blood and blood vessels. Arteries carry blood and the oxygen in it from the lungs to all of the other cells of the body. Once the oxygen is used, veins carry the blood back to the heart. Inside the heart are four chambers. Each chamber is a little pump that pushes the blood through the body. It takes 1-2 minutes for blood to circulate all around your body.
The Excretory System removes waste that collects in the body during metabolism. Metabolism is when the bady takes in air, food and liquid. The body uses most of these things to grow and make energy, but the body can’t use all of it. The leftovers are called waste. These waste products can be toxic if they are not eliminated. Major organs of the excretory system include the kidneys, liver, bladder, lungs and large intestine. Yes, even the lungs – when you exhale, the lungs eliminate gases your body can’t use.
If you need to do a report about one of the countries of the world the websites and books on this page will help you get started. You will be able to find maps, flags, national anthems, food, clothing, games and more. To find library books, use the online catalog for kids Sherlock Jr.
To find a book
about a particular country, like the book on the right about Uganda, just type the name of the country in the search box in Sherlock Jr. and click “search.”
There are also country books about themes, like “games” or “festivals”, that will have information about individual countries. The book on the right, for example, is a cookbook that features recipes around the world. In books like these, indiviual countries will have a chapter or a section. Or, you might have to look up a country’s name in the index at the back of the book, to find out which page to go to.