Digestive system-B
1. The wall of GI tract contains which is under control of
, and , and these two plexuses are
under control of : smooth muscle; enteric nervous sys- tem; Meissner,
Auerbach; autonomic nervous system
2. parasympathetic nervous system is: more active in GI tract than sympathetic
3. What accelerates the peristalsis or motility of GI tract and secretion of endocrine hormones?:
Parasympathetic nervous system, Vagus Nerve (CN X), Acetylcholine
4. In GI tract, and specifically the stomach, we have many different types of cells. And each cell:
secretes a specific hormone or enzyme, and each has a specific function
5. propulsive: peristalsis, "forward flow"
6. In propulsive (peristalsis, "forward flow"): the gastric content is actually under control of a
spike wave
7. **Before receiving the food content by GI tract, we have: slow wave
8. **When it receives the food content, it then becomes: spike wave
9. **Don't forget in small and large intestine, before having spike wave: we have a segmental
contraction
10.What is segmental contraction, which exists in small and large intestines?-
: It means mixing of food content with enzymes for digestion, which takes a longer time for
digestion
11.This segmental contraction is different than a spike wave or peristalsis because: because
segmental contraction is for digestion and absorption of food content by epithelial cell of
intestine and later on into bloodstream
12.**Segmental contraction is for: digestion and absorption of food content by epithelial cell of
intestine and later on into bloodstream
13.**Remember, in small and large intestine we should have: slow wave, seg- mental contraction,
and then spike wave (or propulsive or peristalsis)
14.**Peristalsis exists in: every 2 to 3 centimeters of GI tract
15.**BUT segmental contraction exists in: every 1 centimeter of GI tract, which is necessary for
mixing of food contents and enzymes for digestion and absorption
16.2-3 centimeters is required in Propulsive (Peristalsis) because: the food content is able to
move on to the next segment of the GI tract
17.**Again, before propulsive we need to have: mixing of food content with the enzymes for
digestion, or breaking down of the food content
18.For example mixing with enzymes: breaks protein down into small pieces, which is easier
for absorption by GI tract
, Digestive system-B
19.If there is any defect or malfunction of the enteric nervous system, such as in the Meissner's
plexus, it will lead to: malabsorption of food content
1. The wall of GI tract contains which is under control of
, and , and these two plexuses are
under control of : smooth muscle; enteric nervous sys- tem; Meissner,
Auerbach; autonomic nervous system
2. parasympathetic nervous system is: more active in GI tract than sympathetic
3. What accelerates the peristalsis or motility of GI tract and secretion of endocrine hormones?:
Parasympathetic nervous system, Vagus Nerve (CN X), Acetylcholine
4. In GI tract, and specifically the stomach, we have many different types of cells. And each cell:
secretes a specific hormone or enzyme, and each has a specific function
5. propulsive: peristalsis, "forward flow"
6. In propulsive (peristalsis, "forward flow"): the gastric content is actually under control of a
spike wave
7. **Before receiving the food content by GI tract, we have: slow wave
8. **When it receives the food content, it then becomes: spike wave
9. **Don't forget in small and large intestine, before having spike wave: we have a segmental
contraction
10.What is segmental contraction, which exists in small and large intestines?-
: It means mixing of food content with enzymes for digestion, which takes a longer time for
digestion
11.This segmental contraction is different than a spike wave or peristalsis because: because
segmental contraction is for digestion and absorption of food content by epithelial cell of
intestine and later on into bloodstream
12.**Segmental contraction is for: digestion and absorption of food content by epithelial cell of
intestine and later on into bloodstream
13.**Remember, in small and large intestine we should have: slow wave, seg- mental contraction,
and then spike wave (or propulsive or peristalsis)
14.**Peristalsis exists in: every 2 to 3 centimeters of GI tract
15.**BUT segmental contraction exists in: every 1 centimeter of GI tract, which is necessary for
mixing of food contents and enzymes for digestion and absorption
16.2-3 centimeters is required in Propulsive (Peristalsis) because: the food content is able to
move on to the next segment of the GI tract
17.**Again, before propulsive we need to have: mixing of food content with the enzymes for
digestion, or breaking down of the food content
18.For example mixing with enzymes: breaks protein down into small pieces, which is easier
for absorption by GI tract
, Digestive system-B
19.If there is any defect or malfunction of the enteric nervous system, such as in the Meissner's
plexus, it will lead to: malabsorption of food content
