Page 20 - Viva ICSE Science 5 : E-book

QUICK LOOK

1. The system that helps in the transportation of substances to and from various parts of the
body is called the circulatory system.
2. The circulatory system comprises of three main parts—heart, blood and blood vessels.
3. The heart is a muscular organ that acts like a pump to force blood throughout the body.

4. The human heart is four-chambered—two upper chambers called the auricles and two
lower chambers called the ventricles.
5. Blood is a red-coloured fl uid which fl ows inside the blood vessels.
6. Inside the body, blood fl ows through a network of tubes and channels. These tubes and
channels are known as blood vessels.

7. There are three types of blood vessels—arteries, veins and capillaries.
8. Blood keeps on circulating between the heart and the rest of the body.

EXERCISES

A. Fill in the blanks.

1. ___________ receive blood from the body, while ___________ pump blood
throughout the body.

2. The main function of the heart is the ___________ of blood.

3. ___________ helps in maintaining temperature of the body.

4. ___________ help in clotting of blood.

5. ___________ lie closer to the surface of the skin and can be seen as greenish-

blue lines.

6. The arteries divide into the ___________ in the body tissues and organs.

B. Write (T) for true and (F) for false statements.

1. The circulatory system comprises of two main parts—the heart
and the blood vessels.

2. Pure blood is rich in oxygen.

3. The liquid portion of the blood transports nutrients.

4. Red blood cells help to fi ght infections.

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