The human body is a wonderful machine. It is so complicated that scientist still do not know many things about it. Fill in the blanks and complete these sentences about the human body.
1. Our brain is made up of billions of ________ that send and receive information from around the body.
Ans. Nerve-cells
2. The brain is protected by the skull or the ________ which is made up of 22 bones.
Ans. cranium
3. The brain floats in the _______ fluid that saves it from shocks as well as from infections.
Ans. Cerebrospinal
4. Our saliva contains an _________ that starts the chemical digestion of the starchy food.
Ans. enzyme
5. When we swallow food, a flap-like structure called the ________ closes our wind pipe.
Ans. epiglottis
6. The inner walls of our _______ secret hydrochloric acid that kills bacteria and helps in the digestion of food.
Ans. stomach
7. Human beings grow ________ sets of teeth during their life time-baby teeth (20) and adult teeth(32).
Ans. two
8. _________ are used to help straighten or align deformed teeth.
Ans. Braces
9. The left lung is slightly smaller than the right lung to allow space for our _______.
Ans. heart
10. _________ is a dangerous disease that makes it harder for our lungs to absorb oxygen from the air we breathe.
Ans. Pneumonia
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