GIT secretions review

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⁺)