Page 36 - Future Stars Science Explorer-5

the sound waves to a thin membrane called the eardrum. The eardrum
vibrates (moves) very fast. These vibrations are passed on to the inner ear,

and from there they are carried on to the brain through the auditory nerve.
The brain then interrupts the message, and we are able to hear the sound.

Nose

The nose is the organ of smell. Dust particles

enter our nose along with the air we breathe Nasal bone
in. The inner lining of the nose has small hair Upper lateral

that trap dust particles and filter the air. The cartilage
upper part of the nose has nerve cells that form

the olfactory nerve. The olfactory nerve Lower
lateral cartilage
carries messages from the nose to the brain.

Tongue Structure of a nose
Bitter
The tongue is the organ of taste. It also helps us to
speak. The surface of the tongue is covered with
Sour
tiny bumps. Inside these bumps are the taste

Salty receptor cells called taste buds. These buds have
nerve endings that carry message to the brain. The

Sweet
brain tells us whether something is sweet, sour,
The tongue salty or bitter.

Critical Thinking

Circle the odd one out.

1. Medulla, Liver, Cerebellum, Cerebrum

2. Eye, Nerves, Spinal cord, Medulla
3. Iris, Pupil, Retina, Eardrum

Skin

The skin forms the outermost covering of the body and is richly supplied with
nerves that connect to the spinal cord. We often feel things with the tip of our

fingers. The skin helps us to sense pain, temperature (hot and cold) and feel
things.

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