2020 PHYSIOLOGY: GI Motility, Digestion, Secretion, Absorption
Understanding GI Physiology: A Quiz Experience
Test your knowledge on gastrointestinal physiology with our comprehensive quiz! This quiz covers essential topics such as GI motility, digestion, secretion, and absorption, allowing you to deepen your understanding of how the human digestive system works.
Join the challenge to enhance your knowledge with questions that range from basic concepts to more advanced topics:
- Multiple choice questions
- Coverage of key physiological processes
- Engaging and informative
Which of the ff is true about smooth muscles?
Actin and myosin filaments are not present
There is troponin-tropomyosin complex for contraction
Ca2+ is the ion for depolarization
Few SER but numerous mitochondria
All of the above
None of the above
The enteric smooth muscle is a ______________.
Single unit
Multiunit
Fixed unit
None of the above
Depolarization is stimulated by which of the following neurotransmitters?
Norepinephrine
Epinephrine
Serotonin
Acetylcholine
Which of the ff triggers the true action potential in the GI smooth muscle?
Na+ influx
Na+ efflux
Ca2+ influx
Ca2+ efflux
Which among the components of saliva aids in the dissolution of nutrients from food?
Water
Mucin
Bicarbonate
Amylase
HCl is secreted by which gastric gland cell?
Mucus cell
Zymogen cell
Parietal cell
G-cell
Pepsin is actively degrading proteins in the small intestine.
True
False
Gastric secretion is inhibited by the following except
Secretin
Calcitonin
Epinephrine
Somatostatin
If duodenum is distended, which of the ff events happen?
A. Gastric emptying slows down
B. Gastric emptying is rapid
C. Decrease in duodenal pH
D. Increase in duodenal pH
E. A and c
F. B and d
Release of pancreatic enzyme is stimulated by which hormone?
Secretin
Cholecystokinin
Gastrin
Motilin
Which carrier is responsible for transporting reducing sugars from the intestinal cell to the blood?
Na+/Glucose transporter
Na+/K+ ATPase pump
Glucose Transporter 5
Glucose Transporter 2
IKI solution is introduced to Sample A. Sample A becomes caramel-colored. What can you conclude from this?
There is no starch in the solution.
There is no amylase in the solution.
There is starch but no amylase in the solution.
There is no reducing sugar in the solution.
What will be the result of a Benedict's assay to a sample containing starch and amylase that is boiled for a minute?
It will produce a reddish brown solution.
It will produce an orange solution.
It will contain presence of reducing sugars.
It will yield a negative result.
Activity of amylase is most effective at which pH value?
Acidic pH (pH < 3)
Alkaline pH (pH > 8)
Physiologic pH (pH = 7.4)
PH value has no effect
Greater optical density obtained from a spectrophotometric measurement means
A. Greater amount of hydrolysis
B. More free amino acids produced
C. Presence of pepsin
D. All of the above
E. None of the above
Pepsin activity is highest at which pH value?
Acidic pH
Alkaline pH
Physiologic pH
PH value does not matter
What is the importance of bile salts?
Aids in fat digestion
Reduced surface area of lipid
Inhibits lipase activity
None of the above
PH is expected to ________ upon hydrolysis of TAGs by pancreatic lipase.
Increase
Decrease
Remain the same
PH does not matter
Spike potentials increase due to ______ activity of ANS.
Sympathetic
Parasympathetic
Pathetic
Palmitic
The digestive system depends only on extrinsic innervation for motility.
True
False
Which nerve plexus is responsible for regulation of secretomotor activity of the GI tract?
Auerbach's plexus
Meissner's plexus
Myenteric plexus
Gastric plexus
What is the primary stimulus for reflex responses throughout the GI tract?
Presence of food
Secretion of enzymes or hormones
Nervous activity
Peristaltic movements
Gravity is necessary for movement of food throughout the GI tract.
True
False
BER in the stomach reaches 3-4x in a minute.
Gastric peristalsis
Gastric retropulsion
Gastric accomodation
Gastric emptying.
Proximal stomach relaxes once LES relaxes to prepare for entry of food.
Peristalsis
Retropulsion
Accomodation
Emptying
Pyloric antrum propels bolus to the proximal stomach until bolus becomes small.
Peristalsis
Retropulsion
Vomiting reflex
Gastroesophageal reflux
Pressure becomes high that intense contractions propels digested food out of the pylorus.
Peristalsis
Retropulsion
Reflux
Emptying
In migrating myoelectric complex, the pyloric sphincter remains contracted.
True
False
Decreased motility in the colon will _________.
A. Increase water reabsorption
B. Decrease water reabsorption
C. Release constipated stools
D. Release watery stools
E. A and C
F. B and D
Voluntary ________ of the external anal sphincter leads to defecation.
Contraction
Relaxation
Distention
Constriction
The anorectal angle straightens when abdominal pressure is increased. This means that the puborectalis muscle is ____.
Contracting
Relaxing
No change in tension
Spastic
Forceful expulsion of gastric contents from duodenum to the mouth.
Defecation
Vomiting
Valsalva's maneuver
Swallowing
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