Observe the flow chart and answer the questions:
(1) How do the salivary glands recognise the taste sensation ?
(2)When we get cold, we are unable to recognise the taste. Why ? Give the reasons.
(3) How does the information of taste reaches to the brain ?
(4) By which coordination the tastes are recognised ?
Answers
Answer:
1) In the initial process of taste perception, saliva acts as a solvent for taste substances; salivary water dissolves taste substances, and the latter diffuse to the taste receptor sites. During this process, some salivary constituents chemically interact with taste substances.
2) When we're sick, our noses are often blocked with mucus. Also, the tissues inside our nose can become swollen and inflamed. This prevents us from smelling properly. Because your sense of smell is so tied to your sense of taste, if you can't smell things properly, you won't be able to taste them properly, either.
3) A message of taste moves from the taste buds in the tongue to the brain through cranial nerves. The signal then moves to the thalamus in the brain. Finally, the thalamus passes the signal onto a special area in the frontal lobe of the cerebral cortex, the gustatory cortex, where the taste signal is interpreted.
4) Taste can be identified when the tongue is pressed against the palate. The fifth cranial nerve has been found to control the movement of muscles in the jaw. The food taken by us has to be broken down into constituent substances for proper digestion, assimilation and energy releasing process.
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