30 Questions
Which of the following organs is NOT a primary digestive organ?
Salivary glands
What is the primary function of the Meissner plexus in the GI tract?
Regulation of secretory functions of GI tract
Which of the following is NOT a function of the GI tract?
Respiration
What is the term for the movement of food through the digestive tract?
Motility
Which of the following neurotransmitters is NOT associated with the Auerbach plexus?
Dopamine
What is the name of the nerve plexus that regulates the movements of the GI tract?
Auerbach plexus
What is the approximate volume of saliva secreted per day?
1000 mL to 1500 mL
What is the pH of mixed saliva from all the glands?
6.35 to 6.85
What percentage of saliva is composed of water?
99.5%
What is the role of lingual lipase in saliva?
It hydrolyzes triglycerides into fatty acids and diacylglycerol
What is one of the excretory functions of saliva?
Excretion of substances like mercury
What is the specific gravity of saliva?
1.002 to 1.012
Which type of nerve fibers inhibit the movements and decrease the secretions of the GI tract?
Sympathetic nerve fibers
Which neurotransmitter is secreted by sympathetic nerve fibers to inhibit the GI tract?
Noradrenaline
Which nerves carry preganglionic parasympathetic nerve fibers to the mouth and salivary glands?
Facial and glossopharyngeal nerves
Which segment of the spinal cord gives rise to preganglionic sympathetic nerve fibers?
Thoracic region (T5 to L2)
What is the effect of sympathetic nerve fibers on the sphincters?
Constriction
Through which nerve do preganglionic parasympathetic nerve fibers to the esophagus, stomach, small intestine, and upper part of large intestine pass?
Vagus nerve
Where are the pyloric glands located in the stomach?
Pyloric part
Which type of cell is responsible for secreting hormones in the stomach?
Enteroendocrine cells
What is the primary function of gastrin in the stomach?
Stimulates gastric secretion and motility
What is the pH range of gastric juice?
0.9 to 1.2
What is the approximate daily volume of gastric juice secretion?
1200 mL/day to 1500 mL/day
What is the process of secreting hydrochloric acid in the stomach?
Active process
What is the source of carbon dioxide in the parietal cell?
Metabolic activities of the parietal cell
What is the purpose of carbonic anhydrase in the parietal cell?
To facilitate the formation of carbonic acid
What is the fate of the bicarbonate ion generated during the formation of hydrochloric acid?
It enters the blood and combines with sodium
What is the effect of vagal stimulation on the secretion of hydrochloric acid?
It stimulates the secretion of hydrochloric acid
What is the optimal pH for the activation of pepsinogen?
Below 6
What is the primary function of pepsin in the digestive process?
To convert proteins into proteoses, peptones, and polypeptides
Test your knowledge of the primary and accessory digestive organs, their organization, and primary functions of the Gastrointestinal Tract (GIT) including motility and secretion. This quiz covers the basics of human physiology and is suitable for students of Dr. Mai Adawi's Physiology class at FOM-SCU.
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