Biology Questions and Answers
buffer for the mouth pH and it has an
important rol(also present in tears, colostrum,e of having IgA antibodies
mother’s milk and in the mucosae of the
intestine anorganism against pathogens.d airways) that protect the
- What is the salivary
digestive enzyme? Which type
of food does it digest and into
which smaller molecules does
it transform the food?
The salivary hydrolase is known as
salivarydigests carbohydrates b amylase, or ptyalin. Ptyalinreaking starch (^)
and glycogen, glucose polymers, into
maltose (a dextrin. glucose disaccharide) and
- Why doesn't the food
enter the trachea instead of
going to the esophagus?
When food is swallowed treflex is activated and the larynxhe swallow
elevates anthe food bolus entering the trachead closes to avoid portions o f
causing aspiration of strange material to
the bronchi.
- Is the esophagus a
muscular organ? Why even in
a patient lying totally flat on a
hospital bed can the
swallowed food reach the
stomach?
The esophagus is a predominantlymuscularcorrect. The esophagus is a m organ so the assertion uscularis (^)
tube formed in its superior third of
striated mthird of mixed muscle tissue uscle tissue, in its mid(striateddle (^)
and smooth) and in its lower third of
smooth the esophagus provides the muscle tissue. The peristalsimovements of
of the food towards the stomach even
without gravitational help.
- What is the route of the
ingested food from swallowing
until the duodenum?
Until reaching the duodenum the foodenters the mouth, passes the pharynx, (^)
goes down the esophagus and passes
the stomach.
- what is the valve that
separates the stomach from
the esophagus called? What is
its function?
The valve that separates the stomach
from ththe function oe esophagus is thf preventing acid ge cardia. Iastrict has
content from entering back into the
esophagus. Icauses gastroesopnsufficiency ohageal reflux, af this valve
disease in which patients complain of
bloating aburning).nd heartburn (retrosternal
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