This soup doesn't taste very good. Is there a reason for that?
There sure is! Your tongue has receptors which collect information and send it to your brain.
Yea! and there is a tongue diagram that tells you where food is sweet, sour, bitter, salty, or umami on your tongue. However, it's wrong. you can taste all of those anywhere on your tongue.
Did you know that "Umami" is Japanese word for savory?
Whenever we eat food, chemicals are released in the mouth. Those chemicals reach taste buds which then contact nerve cells. Those nerve cells then work in a chain reaction and transmit messengers to other cells to activate more nerve cells.
How do we taste then?
When enough nerve cells are activated, a signal is sent to the brain. Finally, the brain determines what type of taste.
Wow that is amazing!
You cannot taste well when you have a cold, because channels are blocked and nerve impulses cannot be transmitted to the brain.