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Facts About the Circulatory System and the Immune System:
Introduction:

All cells need food and oxygen. But how do they get all the food and oxygen they need? This artical will tell you all about the Circulatory System and the Immune System. Here are some frequently asked questions about the Circulatory and Immune Systems. Circulatory System Questions:
 * 1) What is the Circulatory System?
 * 2) Why do we need blood?
 * 3) Why do we need blood vessels?
 * 4) What are blood types?
 * 5) What are the parts of blood?
 * 6) Why do we need White blood cells(WBC), Red blood cells(RBC), Plasma, and Platelets?

Immune System Questions:
 * 1) What is the Immune System?
 * 2) What are the germ fighting cells called?
 * 3) Why do we need the three different White Blood Cells(WBC)?
 * 4) Which White Blood Cell(WBC) prevents us from getting sick?

Chapter one: Circulatory System:
 * Blood carries food and oxygen to all the cells in the human body.
 * Blood is carried around the body by the Circulatory System.
 * The Circulatory System is made of three parts: blood, blood vessels, and the heart.

Chapter two: Blood away carbon dioxide.
 * Blood is mostly water.
 * Plasma is the watery part of blood.
 * Blood has red and white blood cells in it.
 * Red blood cells carry oxygen to all parts of the body and carry
 * White blood cells fight germs.
 * The human body has about six quarts of blood.

Chapter three: Blood Vessels: the heart. to the heart. body.
 * Blood is carried in tiny tubes called blood vessels.
 * Arteries are large blood vessels that carry blood away from
 * Veins are small blood vessels that carry blood back
 * There are over 100,000 miles of blood vessels in the human

Chapter four: The Heart: body. pound.
 * The heart is a strong muscle which pumps blood around the
 * The heart is about the size of your fist and weighs about one
 * The heart has four parts.
 * The heart pumps blood carrying oxygen to the cells
 * The heart pumps blood about 70 times each minute.

Conclusion: So in conclusion the Circulatory System is amazing.

Facts About the Respiratory System.
used right away are stored.
 * Your body has storage systems for food.
 * When you eat, the nutrients that are not

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Erin May♥♥♥

Functions of the Digestive System:

 * The digestive system has three main functions.