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Nervous System Class 5 Notes Science

Introduction

Sense organs are the windows to the outside world and connect us to our surroundings. We have five senses: eyes, ears, nose, tongue and skin.

Nervous System Class 5 Notes Science

Eyes

It is the most important sense organ, which works like a camera that takes pictures of the world around us. The different parts of the eyes are: 

  • Eyelid: It covers our eyes when we sleep or blink our eyes. 
  • Eyelashes: They protect our eyes from dust. 
  • Pupil: It is the black circle that lets light into our eyes. 
  • Iris: It is the colored part around the pupil. 
  • Cornea: The circular and transparent front portion of the eye protects the pupil and iris. 
  • Retina: It is the back of the eye where images are formed. 
  • Optic nerve: It is the nerve that connects the eyes to the brain. The optic nerve carries the image to the brain.

Structure of an eyeStructure of an eye

Care of the eyes

  • Wash your eyes regularly with clean water. 
  • Do not work in dim light or very bright light. 
  • Sit six feet away from the television.
  • Do not watch television for long hours. 
  • Do not play computer games or video games for long hours. 
  • While reading, keep your book about 12 inches from your eyes. Always sit upright while reading. 
  • Do not read in a moving vehicle.

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Ears

Ears help us to hear the sounds around us. They also help us to maintain balance. The auditory nerve connects the ear to the brain. The structure of the ear is divided into three parts.

  • The outer ear- The visible part of the ear collects sound waves and passes them into the middle ear. 
  • The middle ear- This is the part of the ear that is between the external and internal ear. It helps to amplify the sound received and carries it to the inner ear. 
  • The inner ear- It is the innermost part of the ear.  The sound is carried by the auditory nerve to the brain.

Structure of earStructure of ear

Care of the ears

  • Do not prick sharp objects in your ears. It may injure the eardrum.
  • Use an earbud to clean your ears. 
  • Avoid listening to loud music with plugged earphones.
  • Do not let water enter your ears. Use a dry towel to clean them.

Nose

The nose helps us to smell and breathe. 

  • There are many nerve endings of the olfactory nerves on the upper part of the nose.
  • These nerve endings help us to detect different smells. 
  • The nerve endings get blocked when we have a cold, and thus we are unable to smell anything. 
  • The tiny hair inside the nose act as a filter for dust particles. 
  • They prevent dust particles from entering the nose when we breathe in air.

Nervous System Class 5 Notes Science

Care  of the Nose

  • Blow your nose to keep your nostrils clean. 
  • Do not put objects into the nose. 
  • Always breathe through the nose.  

Tongue

  • The tongue helps us to taste. 
  • It also helps in speaking. 
  • There are tiny sensory structures on the tongue called taste buds which help us to distinguish different tastes. 
  • Taste buds have nerve endings that carry messages to the brain. 
  • The tongue can detect four tastes: sweet, sour, salty and bitter. 

TongueTongue

Care of The Tongue 

Clean your tongue with a tongue cleaner when you brush your teeth 

Skin 

The outermost covering and the largest organ of our body is the skin. 

  • The skin has millions of nerve endings that help us to feel hot, cold, pain, pressure or touch. 
  • Tiny pores on the skin's surface help the body's waste to come out as sweat. 
  • The skin protects our internal organs.

Skin of humansSkin of humans Care of The Skin

• Take a bath regularly with soap and clean water to remove dirt from the body.

• Wear clean clothes.

• Use an antiseptic cream if there is a cut or scratch on the skin

The document Nervous System Class 5 Notes Science is a part of the Class 5 Course Science Class 5.
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FAQs on Nervous System Class 5 Notes Science

1. What are the five sensory organs in the human body?
Ans. The five sensory organs in the human body are the eyes, ears, nose, tongue, and skin. These organs help us perceive and process information from our surroundings.
2. How does the eyes contribute to our nervous system?
Ans. The eyes are responsible for our sense of vision and play a crucial role in our nervous system. They detect light and convert it into electrical signals that are sent to the brain for interpretation. This allows us to see and perceive the world around us.
3. What is the function of the ears in the nervous system?
Ans. The ears are sensory organs that contribute to our nervous system by enabling us to hear and maintain balance. They capture sound waves and convert them into electrical signals that are transmitted to the brain. This allows us to perceive and interpret sounds and maintain our sense of balance.
4. How does the nose contribute to the nervous system?
Ans. The nose is an important sensory organ that contributes to our nervous system by allowing us to smell. It contains olfactory receptors that detect and interpret different smells. When we inhale, these receptors send signals to the brain, helping us identify and recognize various scents.
5. What role does the tongue play in the nervous system?
Ans. The tongue is a sensory organ that plays a vital role in our nervous system by enabling us to taste. It contains taste buds that detect different flavors, such as sweet, sour, salty, and bitter. These taste buds send signals to the brain, allowing us to perceive and enjoy different tastes.
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