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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?
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?
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?
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?
What is the function of peristaltic rings in the stomach?
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What does the gastric relaxation limit refer to?
What does the gastric relaxation limit refer to?
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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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