To hold the food within the stomach there are two valves. At the top of the stomach is the lower esophageal sphincter (LES) which prevents backsplash of stomach contents upward into the esophagus. At the bottom of the stomach is the pyloric which controls the "drain" of the stomach.
Hydrochloric acid is found in the human stomach and it helps to digest proteins.
Valves can be found in the heart aswell as the veins
What is the function of the cardiac sphincter?
Valves can be found in the heart. They sit between the Atria and the Ventricles and help aid cardiovascular activity.
Antacids neutralize acid, especially acid found in the stomach. They help cause rapid relief for heartburn.
Valves are found in the heart and in some veins.
DNA has an important function in the nucleus. DNA acts as the brain of the cell and controls the functions of the other organelles.
A siphon is found in octopus, squid, and in some snails and clams. The function is movement, feeding, respiration, and reproduction. In bi-valves, the siphons are paired. In cephalopods, there is a single siphon or funnel which is known as a hyponome.
Involuntary or smooth muscle is found in the stomach.
passive
In the heart and valves
Acid is found in the stomach, because the acid helps in digestion.