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Enhancing Your Scientific Zone

w There are millions of nerve cells in the human body. This number even
exceeds the number of stars in the Milky Way.

w In humans, the right side of the brain controls the left side of the body while

Scientific Terms
Beverage : a special drink other than water
Antiseptic : a substance that prevents the growth of disease-causing micro
organisms
Olfactory nerve : the first cranial nerve
Auditory canal : either of the passages in the outer ear from the auricle to the
tympanic membrane

Chapter at a Glance
³ The brain, the spinal cord and the nerves make up the nervous system.

³ The nervous system controls all the systems of the body.
³ The basic unit of the nervous system is a nerve cell.
³ The brain has three main parts, that are cerebrum, cerebellum and medulla.
³ The nerves carry messages to and from the brain throughout the body.
³ There are five sense organs which help us to respond to our surroundings.
³ It is important to take care of our sense organs.

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Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
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Fill in the blanks with the correct word :
electrically; processes Central nervous system motor Cerebrum retina
1. _____________ controls our voluntary movements.
2. _____________ is the biggest part of the brain.
3. A nerve cell is an _____________ excitable cell that _____________ and

transmits the information.
4. The black spot in the centre of eye is called _____________ .
5. The _____________ nerves carry messages from the brain to the muscles.

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