GIT Part 1: Digestive System Functions
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Questions and Answers

Which of the following is NOT a major digestive process?

  • Propulsion
  • Respiration (correct)
  • Ingestion
  • Defecation

Which layer of the GIT wall is responsible for the secretion of mucus, enzymes, and hormones?

  • Submucosa
  • Muscularis externa
  • Mucosa (correct)
  • Serosa

Which of the following is an accessory digestive organ?

  • Small intestine
  • Pharynx
  • Stomach
  • Salivary glands (correct)

What is the purpose of the digestive processes?

<p>To make food less complex at each step and make nutrients available to the body (A)</p> Signup and view all the answers

What is the function of the propulsion process?

<p>To move food through the alimentary canal (B)</p> Signup and view all the answers

What is the function of the mechanical digestion process?

<p>To increase the surface area of ingested food (B)</p> Signup and view all the answers

What is the main function of the inner circular layer of the muscularis externa?

<p>To form sphincters and prevent food backflow (C)</p> Signup and view all the answers

What is the main component of saliva that helps prevent dental caries?

<p>Bicarbonate buffers (D)</p> Signup and view all the answers

What is the effect of parasympathetic stimulation on salivary glands?

<p>It produces abundant flow of watery saliva (C)</p> Signup and view all the answers

What is the main function of the serosa?

<p>To provide a protective outermost layer of intraperitoneal organs (C)</p> Signup and view all the answers

What is the primary function of the enteric nervous system?

<p>To control GI tract motility (C)</p> Signup and view all the answers

What is the effect of sympathetic stimulation on salivary glands?

<p>It elicits a smaller volume of thick saliva (B)</p> Signup and view all the answers

What is the primary function of the pharynx in the swallowing process?

<p>To voluntarily control the bolus of food (D)</p> Signup and view all the answers

How long does it take for solid food to pass through the oropharynx to the stomach?

<p>8 seconds (A)</p> Signup and view all the answers

What is the function of the pylorus region in the stomach?

<p>To hold 30 ml of chyme and act as a dynamic filter (B)</p> Signup and view all the answers

What is the result of the absence of intrinsic factor in the stomach?

<p>Pernicious anemia (A)</p> Signup and view all the answers

What is the primary function of the stomach in the digestive process?

<p>To secrete gastric juice and churn food (D)</p> Signup and view all the answers

What is a common cause of vomiting or emesis?

<p>Presence of irritants such as bacterial toxins (C)</p> Signup and view all the answers

Flashcards

Not a major digestive process

Respiration is not involved in digestion.

Layer responsible for secretion

Mucosa secretes mucus, enzymes, and hormones in the GIT.

Accessory digestive organ

Salivary glands aid in digestion alongside the main organs.

Purpose of digestive processes

To break down food and make nutrients available to the body.

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Function of propulsion process

Moves food through the alimentary canal.

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Function of mechanical digestion

Increases the surface area of ingested food.

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Inner circular layer of muscularis externa

Forms sphincters to prevent food backflow.

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Component of saliva preventing caries

Bicarbonate buffers help protect teeth from decay.

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Effect of parasympathetic stimulation on saliva

Produces abundant flow of watery saliva.

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Function of the serosa

Provides the protective outer layer of intraperitoneal organs.

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Primary function of the enteric nervous system

Controls GI tract motility.

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Effect of sympathetic stimulation on saliva

Elicits a smaller volume of thick saliva.

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Primary function of the pharynx

Voluntarily controls the bolus of food during swallowing.

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Time for food to pass oropharynx

Solid food takes about 8 seconds to reach the stomach.

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Function of pylorus region

Holds 30 ml of chyme and acts as a filter.

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Absence of intrinsic factor result

Causes pernicious anemia due to vitamin B12 deficiency.

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Primary function of the stomach

Secretes gastric juice and churns food.

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Common cause of vomiting (emesis)

Presence of irritants like bacterial toxins leads to vomiting.

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