The Sense of Taste

1. The tongue is the sensory  organ that gives us the sense of taste. It is sensitive to sweet, salty, sour, and bitter tastes.

2. The upper surface of the tongue is rough. This is because it is covered with taste buds.

3. Taste receptors can be found in the taste buds. They responds to various chemicals in food.
     Each type of taste receptor is sensitive to a certain types of taste.

4. a) The tongue has four types of taste receptor.
    b) These are sweet receptors, sour receptors, salty receptors, and bitter receptors.
    c) Each receptor is located in a particular area of the tongue. Thus, each area of the tongue is    
        able to detect a certain type of taste.

5. Chemicals in food dissolved in saliva. => The chemicals stimulate taste receptors in the taste  
    buds => Impulses form the taste receptors are sent along the nerves to the brain. => The brain
    identifies the taste.