The control center , the effector and the receptor ...
Answer:
I dont know the choices, write clearer
Explanation:
The answer is c it allows the body to increase blood flow
A is the answer to your question
The esophagus, which passes food from the pharynx to the stomach, is about 25 cm(10 inches<span>) in length; the width varies from 1.5 to 2 cm (about 1 inch). The esophagus lies behind the trachea and heart and in front of the spinal column; it passes through the diaphragm before entering the stomach.</span>