Acetylcholine Pathway in Salivary Gland Cells

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What is the primary function of the intrinsic factor secreted by the stomach?

To aid in the mechanical digestion of food

To facilitate the absorption of vitamin B-12 in the intestines (correct)

To neutralize stomach acid

To break down dietary protein

Which of the following is NOT a function of the stomach?

Autoclave (high acidity)

Mechanical digestion

Secretion of digestive enzymes (correct)

Protein hydrolysis

Which region of the stomach contains the gastric pits and glands?

All regions of the stomach contain gastric pits and glands (correct)

Corpus

Antrum

Fundus

What is the primary function of saliva secreted by the salivary glands?

Lubrication and moisturization of the oral cavity (C) Signup and view all the answers

Which of the following stimuli inhibits the salivary gland's secretion of saliva?

Sleep (C) Signup and view all the answers

How does the salivary nervous system stimulate salivary secretion?

Through the release of norepinephrine, which binds to beta-adrenergic receptors on salivary gland cells (C) Signup and view all the answers

What is the relationship between the concentrations of Na+ and Cl- in saliva compared to plasma?

Saliva has lower concentrations of Na+ and Cl- than plasma (B) Signup and view all the answers

What is the relationship between the concentration of K+ in saliva compared to plasma?

Saliva has higher K+ concentration than plasma (C) Signup and view all the answers

How does the HCO3- concentration in saliva compare to plasma at low flow rates?

Saliva has lower HCO3- concentration than plasma (B) Signup and view all the answers

How does the HCO3- concentration in saliva compare to plasma at high flow rates?

Saliva has higher HCO3- concentration than plasma (D) Signup and view all the answers

Which enzyme in saliva can hydrolyze triglycerides without the help of bile salts?

Lingual lipase (A) Signup and view all the answers

What is the primary regulation of the salivary glands?

Sympathetic nervous system (D) Signup and view all the answers

What is the primary role of the sympathetic nervous system in relation to the GI system?

Inhibits motor activities of the GI system (C) Signup and view all the answers

Which component in saliva plays a crucial role in regulating the pH of saliva?

Bicarbonate (B) Signup and view all the answers

What percentage of water is absorbed by the small intestine?

78% (D) Signup and view all the answers

What is one of the key functions of saliva in the oral cavity, besides digestion?

Maintaining pH in the oral cavity (D) Signup and view all the answers

How does the flow rate of saliva impact the concentration of potassium (K+)?

Increased flow rate decreases K+ concentration (D) Signup and view all the answers

What happens to the pH of saliva as the flow rate increases?

The pH becomes more basic (B) Signup and view all the answers