Gastric emptying (the passage of stomach contents to the small intestine) is regulated by which sphincter of the gastrointestinal system?

Which of the following is not part of the small intestine?

A study of the pH of food as it passes through the digestive tract takes place. Initially, assume that the pH of a food consumed is seven. As it travels down the esophagus, assume that it remains around a pH of seven. After hours of digestion in the stomach and then after it passes to the small intestine and more digestion occurs, the pH is measured. Which of the following represent the most plausible pH readings at the end of stomach and small intestine digestion, respectively?

Which of the following is not absorbed in the ileum of the small intestine?

A patient who complains of acid reflux is given a drug which raises the pH of the stomach. Which macromolecule's digestion will be affected by this drug?

What peptide hormone, produced by D cells in the antrum of the stomach, inhibits the release of acid from the stomach parietal cells?

The stomach secretes large quantities of acid (HCl) into its lumen. What protects the epithelial cells that line the stomach from being broken down by the strong acid?

A patient is recovering from a bacterial toxin that has damaged a large majority of the microvilli in their small intestine. Which is the most immediate issue they should be concerned about?

If person A has less microvilli in his small intestine than person B, this likely means that __________.

The majority of enzymatic digestion occurs in which section of the digestive system?