INSIDE OUR BODY

INSIDE OUR BODY

Answer the following

1.     Discuss the function of the brain and the heart

Brain

ë Our brain has the cerebrum, cerebellum and medulla oblongata.

ë The cerebrum controls the sense organs, memory and intelligence

ë The cerebellum controls the muscle movement and balance of the body.

ë The medulla oblongata controls breathing, heart beat and the blood circulation.

Heart

ë Heart is the pump which circulate blood in the body.

ë Right side of the heart receives deoxygenated blood by veins.

ë Left side of the heart receives oxygenated blood from the lungs

ë This pure blood is sent to various parts of the body by arteries

2. What is alveoli? Explain its functions?    

The lungs are filled with many air sacs called alveoli.

When the air reaches the alveoli, the blood vessels lining the walls of the alveoli take oxygen from the air and give out carbon dioxide.

3. How is food digested in the body?           

ë The stomach churns the food for three to four hours.

ë Here a semi solid paste is formed with the help of digestive juice called chyme.

ë The chyme is sent to the small intestine.

ë The small intestine digest the food completely with the help of juices secreted by liver and pancreas.

4. What role does the gall bladder play in the digestive process.

Gall bladder stores the bile juice which helps in the digestion of fats.

5. How do the kidneys removes wastes from our body?           

ë The kidneys filter the waste from the body.

ë It is sent through ureters to the urinary bladder.

ë The waste combines with water to form urine.       

ë The urine is stored in the urinary bladder.

ë Then it is thrown out periodically through urethra.