1What is the migrating motility complex aThe proximal portio

1.What is the migrating motility complex?

a.The proximal portions of the colon exhibit a pattern of motility that serves to mix the contents rather than move them distally. b. It is a series of intense contractions of the stomach in response to fasting.

c. Peristaltic waves of the stomach in which each wave begins as a weak contraction but progressively increases in force as it advances toward the pylorus.

d. A peristaltic wave in which after a given portion of the intestine contracts, it remains contracted for a longer time before relaxing to propel the contents forward rapidly.

2. Select the incorrect statement regarding gastrointestinal secretion and its regulation.

a. Saliva secretion is regulated by the salivary center in the medulla oblongata and is stimulated by both sympathetic and parasympathetic nerves.

b. Gastric secretion of acid and enzyme is influenced by both neural and hormonal reflexes.

c. The secretion of pancreatic juice is control by neural and hormonal factors.

d. The secretion of bile is controlled by gastrin.

3. Gastrointestinal regulation maximizes the efficiency of digestion and absorption.

a. true

b.false

Solution

1. Option C is the right answer. Migrating motor complex is observed in gastrointestinal smooth muscles. In this gastrointestinal contractions occurs in the interdigestive phase. In this, peristaltic movements occurs in the south muscle cells which initially are slow and then becomes fast or we can say that it goes from the state of virtually no contractions towards high amplitude contractions which result in sweeping out of the residue material after digestion and absorption.