All of the following statements regarding small intestinal motility are true except? (AIPG 2007)
|A||Completely independent of stomach motility|
|B||CCK increases small intestinal motility|
|C||Abdominal distension increases motility|
|D||Increased motility by acetylcholine|
I. Increase in the gastric motility increases intestinal motility.
II. Though the process is not well understood but there are some cells in the smooth muscle of GI mucosa K.a. intestinal cell of cajal which generate basic electrical rhythm (BER) and act as a pacemaker and regulate the motility.
III. These BERs rarely cause muscle contraction but spike potential superimposed on the most depolarizing portion increases muscle tension.
IV. Acetyl choline increase the no. of spikes and tension developed in smooth muscles, hence increases motility.
V. Rate of BER is:
a. 4/min in stomach b. 12/min in duodenum
c. 8/min in distal ileum d. 9/ min in caecum e. 16/min in sigmoid colon