Quizlet what is the role of a sphincter? group of answer choices
a. it regulates the directional flow of gastrointestinal contents.
b. it prevents the movement of food into the trachea.
c. it is a longitudinal muscle that segment food.
d. it stimulates enzyme production.

a.It regulates the directional flow of gastrointestinal contents.

Explanation:

The function of a sphincter:

The sphincter are muscles which are responsible for controlling the passage of the food that is not fully digested direct from the stomach to the small intestine.

These are the muscles that will either contract or close or open your passage route .

The common sphincter are found in our stool passage hole which assists us with the excretion of waste materials after digestion has occured , there is also a sphincter that controls our ability to urinate.

There are also sphincter muscles found in the eyes which assist our eye pupil to shut or contract when hit by a bright light .

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explanation:

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place