4th Class Science Our Body Circulatory System

     Circulatory System

Circulatory system circulates blood throughout the body. It takes oxygen and food to every body cells and sweeps out carbon dioxide and other waste materials. It also helps in fighting infection and keeps our body warm. The circulatory system consists of the heart, blood vessels and the blood. Our heart is a powerful pump made of muscle. It contracts and relaxes automatically about 72 times a minute to pump blood around the body. Our heart is placed in the middle of our chest, slightly to the left.

   Circulatory System  

         Our heart

Our heart has two sides, the right and the left one. The right side pumps blood only to the lungs. The left side, which is the bigger of the two sides pumps blood throughout the body. Blood vessels are thin tube through which blood travels throughout the body.

                   Our Heart    

     Which one of the following is a part of circulatory system?

(a) Heart 

(b) Blood

(c) Blood vessels

(d) All of these                                 

(e) None of these

Answer: (d)

       Which one of the following can be termed as "pumping machine?"

(a) Lung

(b) Nerves

(c) Kidney

(d) Heart                                             

(e) None of these

Answer: (d)