KIN 2YY3 Test 3 Lectures 20-22 Questions With Complete
Solutions
Gastric Phase - Hormonal regulation feedback loop Correct
Answers 1. Gastrin released from G cells into blood when
distended stomach or pH increase (from proteins which buffer
the acid).
This causes:
- Increased release of gastric juices
- Increased constriction of lower esophageal sphincter
- Increased motility in stomach
- Relaxes pyloric sphincter to allow gastric emptying
When pH decreases (loop reversed) - gastrin release inhibited
Gastric Phase - Neural regulation feedback loop Correct
Answers 1. Stretch receptors and chemoreceptors in stomach
2. Sense distended stomach or pH increase (from proteins which
buffer the acid)
3. Submucosal plexus stimulated - sends signal to
Parasympathetic and ENS
4. Begins peristaltic waves and continues secretion of gastric
juice
5. Reversible - as chyme leaves, pH and distention decrease to
decrease gastric juice secretion
, Gastrocolic reflex Correct Answers When the stomach fills,
mass peristalsis moves contents of transverse colon into rectum
Gastroileal reflex Correct Answers When the stomach, the
gastrin hormone relaxes the ileocecal sphincter so the small
intestine will empty and make room
Haustral churning Correct Answers One haustrum fills, once
its distended, it contracts to move the contents to the next
haustrum
Macula densa is the thickened part of which part of the nephron
loop Correct Answers descending loop
mass peristalsis pushes contents where? Correct Answers into
the rectum
Out of the three phases of digestion, which one(s) involve neural
and hormonal mechanisms? Correct Answers The Gastric and
Intestinal phases
Referring to the intestinal phase of digestion, what happens after
the enterogastric reflex? Correct Answers stretch receptors
send signal to medulla oblongata to inhibit PNS and increase
SNS nerves to stomach
Referring to the intestinal phase of digestion, what is the
enterogastric reflex? Correct Answers when stretch receptors
in the duodenum sense distention
Solutions
Gastric Phase - Hormonal regulation feedback loop Correct
Answers 1. Gastrin released from G cells into blood when
distended stomach or pH increase (from proteins which buffer
the acid).
This causes:
- Increased release of gastric juices
- Increased constriction of lower esophageal sphincter
- Increased motility in stomach
- Relaxes pyloric sphincter to allow gastric emptying
When pH decreases (loop reversed) - gastrin release inhibited
Gastric Phase - Neural regulation feedback loop Correct
Answers 1. Stretch receptors and chemoreceptors in stomach
2. Sense distended stomach or pH increase (from proteins which
buffer the acid)
3. Submucosal plexus stimulated - sends signal to
Parasympathetic and ENS
4. Begins peristaltic waves and continues secretion of gastric
juice
5. Reversible - as chyme leaves, pH and distention decrease to
decrease gastric juice secretion
, Gastrocolic reflex Correct Answers When the stomach fills,
mass peristalsis moves contents of transverse colon into rectum
Gastroileal reflex Correct Answers When the stomach, the
gastrin hormone relaxes the ileocecal sphincter so the small
intestine will empty and make room
Haustral churning Correct Answers One haustrum fills, once
its distended, it contracts to move the contents to the next
haustrum
Macula densa is the thickened part of which part of the nephron
loop Correct Answers descending loop
mass peristalsis pushes contents where? Correct Answers into
the rectum
Out of the three phases of digestion, which one(s) involve neural
and hormonal mechanisms? Correct Answers The Gastric and
Intestinal phases
Referring to the intestinal phase of digestion, what happens after
the enterogastric reflex? Correct Answers stretch receptors
send signal to medulla oblongata to inhibit PNS and increase
SNS nerves to stomach
Referring to the intestinal phase of digestion, what is the
enterogastric reflex? Correct Answers when stretch receptors
in the duodenum sense distention
