Question

In frog pyloric sphincter is located between
a. Fundus and pylorus
b. Cardiac and fundus
c. Oesophagus and pharynx
d. Stomach and duodenum

Answer 1

Hint: The pylorus is the furthest part of the stomach that connects to the duodenum. It consists of two parts. The antrum, which fastens to the body of the stomach, and the pyloric canal, which joins to the duodenum. The pyloric sphincter is a type of valve. It is a strong ring of flattening muscle at the end of the pyloric canal which lets food move from the stomach to the duodenum.

Complete answer:
• It is a band of flat muscle at the junction between the pylorus of the stomach and the duodenum of the small intestine. It has an important part in digestion, where it acts like a valve to control the flow of partially digested food from the stomach to the small intestine.
• It plays an important role in controlling the rate of digestion and the direction of chyme movement in the gastrointestinal tract.
• In the frog, the pyloric sphincter is located between the stomach and duodenum. The pylorus contains two parts. The pyloric antrum opens to the body of the stomach while the pyloric canal that unfolds to the duodenum. The pyloric sphincter controls/manages the exit/quit of digested food from the stomach to the small intestine.

Hence, the correct answer is option (D).

Note: The pylorus contains numerous glands, including gastric pits, which constitute about half the depth of the pyloric mucosa. The pyloric antrum is the first portion of the pylorus. It is near the lower portion of the stomach, proximal to the pyloric sphincter. It separates the stomach and the duodenum. The pyloric sphincter manages the outer flow of gastric contents into the duodenum.