Biology Questions and Answers
- What is the valve that
separates the duodenum from
the stomach called? What is
its function?
The valve that sefrom the duodenum is thparates the e pylorus. Istomacht
has the function bolus within the gastricof keeping the food cavity for
enough time to allow the gastric
digestion to take pfunction of preventing the intestinallace. It also has the
content from going back into the
stomach.
- What is the pH inside the
stomach? Why is there a need
to keep that pH level? How is
it maintained? Which are the
cells that produce that pH?
The normal around 2. So it is an acid pH of the gastricpH. juice is
It is necessary for the gastric pH to bekept acid for the activation of
pepsinogen (a proenzyme the gastric chief cells) into pepsin, thesecreted by (^)
digestive enzyme that acts only under
low pH. This pH level is attainesecretion of hydrochloric acid (HCl) bd by they
the parietal cells.
- Besides being fundamental
for the activation of the main
gastric digestive enzyme how
does HCl also directly
participate in digestion?
With its corrosive effect, HCl also helpsthe rupture of the adhesion food particles, facilitating the digestivebetween (^)
process.
- How is the gastric mucosa
protected from the acid pH of
the stomach?
The gastricsecretory, i.e., epithelium is mucit produces mucus. Theus (^)
mucus covers thpreventing corrosion e stomach wallby the gastric (^)
juice.
- What is the digestive
enzyme that acts within the
stomach? Which type of food
does it digest? What are the
cells that produce that
enzyme?
The digestive enstomach is pepsin. Pepsin zyme that acts in thehas the
function of breaking proteins into
smaller pproduce peptides. Tepsinogen (the zymohe gastric cells thatgen
precursor of pepsin) are the chief cells. - What name does the food
bolus that passes from the
stomach to the duodenum
get?
The partiallybolus that leaves the digested and semifluistomach andd food
enters the duodenum is called chyme.
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