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WorksheetsGIT secretions review
Total questions: 20
Worksheet time: 8mins
Which part of the salivary gland is responsible for the initial formation of saliva?
Salivary acinus
Salivary duct
Salivary gland capsule
Parotid duct
Which enzyme is primarily secreted by the salivary glands to begin the digestion of starch?
Amylase
Lipase
Pepsin
Trypsin
What is the main function of the ducts in the salivary gland system?
Absorb nutrients
Filter blood
Produce digestive enzymes
Transport saliva to the oral cavity
Sympathetic stimulation of the salivary acini cells will result in which of the following?
Exocytosis of mucin proteins into lumen
Increased activation of anion channels
Activation of the muscarinic 3 receptor
Decreased sodium (Na+) flux
Parasympathetic stimulation of the salivary glands primarily results in which type of saliva?
Thick, mucous-rich saliva
Watery, enzyme-rich saliva
Saliva with high potassium content
Saliva with low bicarbonate content
Which neurotransmitter is primarily responsible for stimulating the secretion of watery saliva from the salivary glands?
GABA
Serotonin
Dopamine
Acetylcholine
What is the main role of myoepithelial cells in the salivary glands?
Secretion of digestive enzymes
Contraction to aid saliva expulsion
Absorption of ions
Production of mucin
Which of the following best describes the composition of saliva produced under sympathetic stimulation?
Watery and enzyme-rich
Thick and mucous-rich
High in bicarbonate
Low in potassium
What is the primary function of mucins in saliva?
Facilitate absorption of glucose
Neutralize gastric acid
Lubricate and protect oral tissues
Initiate protein digestion
Which of the following ions is actively reabsorbed in the ducts of the salivary glands?
Calcium (Ca2+)
Potassium (K+)
Chloride (Cl-)
Sodium (Na+)
Direct parasympathetic stimulation of parietal cells is via which receptor?
H2 receptor
β1 receptor
M3 receptor
CCK2 receptor
Enterochromaffin cells are able to stimulate additional parietal cell activation through which receptor?
M3 receptor
CCK2 receptor
β2 receptor
H2 receptor
Which cell type in the salivary glands is primarily responsible for secreting digestive enzymes?
Ductal cells
Parietal cells
Acinar cells
Myoepithelial cells
What is the main function of bicarbonate ions in saliva?
Initiate lipid digestion
Stimulate taste receptors
Increase mucin viscosity
Buffer acids in the oral cavity
Gastrin is able to stimulate Parietal cells via which receptor?
M3 receptor
CCK2 receptor
H2 receptor
β2 receptor
What triggers the release of cholecystokinin (CCK)?
Presence of fat in duodenum
Low pH in the stomach
High blood glucose levels
Low oxygen levels
What cell type is responsible for producing the majority of bile?
Parietal cells
Hepatocytes
Cholangiocytes
Chief cells
What is a key component of bile?
Glucose
Bile salts
Amino acids
Cholesterol
What phase of gastric secretion involves the sight, smell, or thought of food?
Gastric phase
Intestinal phase
Cephalic phase
Secretory phase
Which enzyme is NOT a protease precursor found in pancreatic secretions?
Trypsinogen
Chymotrypsinogen
Procarboxypeptidase
Lipase
