Daily Archives: 25 gener 2016

TOUCH

TOUCH

* Our skin is the organ we use to touch.

* Our body is covered in the skin. It is the largest organ in the human body.

* Our skin can tell us if something fells soft or hard, hot or cold, rough or smooth.

* Sensory nerves send this information to our brain.

TOUCH

The middle layer of sky, called the dermis, contains nerves and tiny clood vessels. These nerves detect sensations, such as temperature, pain and texture and send this information to our brain.

SMELL AND TASTE

SMELL AND TASTE

SMELL

* Our nose is the organ we use to smell.

* Air enters the nose through the nostrils.

* The olfactory nerve sends information to our brain which tell us what we can smell.

* We ca smell about 10,000 different odours.

TASTE

* Our tongue is the organ we use to taste.

* Our tongue is convered in taste buds. These identify different tastes.

* Nerves send information about the different tastes to our brain.

* We can identify four basic tastes: sweet, salty, bitter and sour.

 SMELL AND TASTE

* Our sense of smell detects chemicals in the air. When the air enters our nose through our nostrils, these chemicals come into contact with nerve receptors. The nerve receptors send this information along the ofactory nerve to our brain.

* The receptor cells for taste are on the tongue inside each taste bud. The receptors detect different tastes (bitter, sour, salty and sweet).