Sonntag, 30. Januar 2011

On Eating - a row of smithereens about hunger and eating No 03

.
.


A shelf filled with country chips, natural chips, oven chips, tortilla chips, taco chips. c ignazwrobel


Last: hypophysis and stomach wall extension reflex

Today: salivary production.

We sit in front of our meal and start eating. With the first bite our mouth has to do three major things.

The first is biting and chewing, the second is a task for the salivary glands in our cheeks: with the first bite the glands start releasing saliva into our mouth.

Saliva is good for two purposes: first it helps to make food slippery. Food has to glide down our esophagus and everybody who once tried to gulp a dry tablet will certainly remember that the tablet got stuck in the throat.

The second task is to fulfil the first step of digestion. An enzyme called ptyalin (nice word) starts to split long chains of molecules into shorter ones.

Now comes the trap:

there´s food that is challenging our salivary glands to continue with the production of saliva. ... for example when eating tacos or chips.

To swallow tacos or potatoe chips we need to change consistency of the food from dry and prickly with hard edges to a swallowable form: liquid. So far so good.

The trap is: as long as the salivary production of our glands is running our hypophysis doesn´t stop sending the message: you are still hungry. More food intake, please.

The rest is subject to your imagination….

Tomorrow: our regulatory circuit and insulin

Keine Kommentare: