Digestive System Functions

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Questions and Answers

What happens to the tone of the muscular wall of the stomach as the volume of content increases?

  • It decreases. (correct)
  • It becomes rigid.
  • It remains unchanged.
  • It increases significantly.

How often do the contraction waves in the stomach occur?

  • Every 15-20 seconds. (correct)
  • Every 5-10 seconds.
  • Every 25-30 seconds.
  • Every 10-15 seconds.

What is the primary mixture of food and gastric secretions called?

  • Grains.
  • Bolus.
  • Saliva.
  • Chyme. (correct)

What is the function of peristaltic rings in the stomach?

<p>To propel content towards the pylorus. (A)</p> Signup and view all the answers

What does the gastric relaxation limit refer to?

<p>Limit of food storage in liters. (D)</p> Signup and view all the answers

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Study Notes

Storage Function

  • The stomach muscle relaxes as the volume of food inside it increases.
  • This means that the pressure inside the stomach doesn't increase significantly, despite the growing content.
  • The stomach can hold between 0.8 and 1.5 liters of food before it starts to feel full.

Mixing and Propulsive Function

  • The stomach secretes gastric juices which mix with the food.
  • Regular muscular contractions, called mixing waves, occur every 15-20 seconds to churn the food.
  • These contractions increase in strength, creating tighter rings that push the food towards the pylorus (the exit of the stomach).
  • The combination of the constricting ring and the closed pylorus forces the food backward, resulting in the mixing of food with gastric secretions.
  • The resulting mixture is called chyme, which is a thick, semi-liquid, cloudy substance.

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