Hours per Day. You can generally expect to spend, at minimum, as much time studying as you spend in class. But most students will spend even more time studying. The University of Michigan-Flint recommends that students spend two to three hours studying for every course hour in which they are enrolled. So if you are taking 15 hours of courses per week, you can expect to spend 30 to 45 hours per week studying, or about six to nine hours each weekday. Your reading speed is a major factor in predicting how long you'll spend studying each day.
The esophagus is the tube that carries food, liquids and saliva from your mouth to the stomach. You may not be aware of your esophagus until you swallow something too large, too hot or too cold. You may also become aware of it when something is wrong.
Next, the tongue pushes the food from the mouth to the throat (pharynx). The voice box (larynx) closes so no food can enter the breathing passages or lungs. Finally, a special muscle called a sphincter, located where the throat and esophagus join, opens so the food can move into the esophagus. Esophageal phase of swallowing. The esophagus is a tube-like organ that connects the mouth and throat with the stomach. At each end, the tube is closed by the contraction of special muscles called sphincters. The esophagus and sphincter muscles are designed to move what is swallowed to the stomach. They also prevent stomach contents from moving back up into the esophagus and breathing passages. Food that enters the esophagus is squeezed down to the stomach by a special muscle contraction called peristalsis.