Answer the following questions.

· What does Circulatory System consist of?

· What is circulation?

· What is the largest artery in the body?

· What do know size of your heart?

· What are the main elements of blood?

· How many liters of blood are in the human body?

2. Use the words in the box to fill in the blanks.
veins arteries nutrients capillaries away	transport oxygen energy dark heat	circulatory lungs carbon dioxide bright to	blood heart pumped intestine atmosphere

All animals need to ________________ materials around to the different parts of their body. This is the job of the ________________ system. The circulatory system consists of a liquid called _______________, a pump called the ________________ and a series of vessels called _________________ and ________________.

One thing that must be transported around is a gas called _____________. Oxygen enters the blood through the ______________. It is then ____________ through the heart and around the body where it is used along with food to make ______________. The body produces another gas called _______________, which is a waste product. This gas is carried back to the heart and then to the lungs where it is released back into the _______________.

The vessels that transport blood _________ from the heart are called arteries. The blood in arteries is _____________ red because it is rich in oxygen. The vessels that transport blood _______________ the heart are called veins. The blood in veins is ______________ red because it is low in oxygen. ________________ are small vessels that join the arteries and veins.

_______________ from food are also transported around the body by the circulatory system. They enter the blood from the small _________________. The circulatory system also helps to regulate temperature by transporting _________________ around the body.

Crossword

Across 3. The place where nutrients enter the blood. 7. The pump in the circulatory system. 8. A small vessel that connects veins and arteries. 10. The circulatory system ___________ nutrients, gases, liquids, and heat around the body. 11. The circulatory system transports this, which helps regulate temperature. 12. The liquid in the circulatory system. 13. The place where oxygen enters the blood and carbon dioxide leaves the blood. 14. A vessel that moves blood to the heart. 15. A gas that is transported in arteries from the lungs to the rest of the body via the heart.	Down 1. The heart ___________ blood. 2. The heart, blood, and vessels. 4. Blood in arteries is ____________ red because it is rich in oxygen. 5. The largest artery in the body. 6. A waste gas that is transported in veins from the body to the lungs via the heart. 9. A vessel that moves blood away from the heart.

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