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Gut bacteria at work
Age 15 · Biology
Gut bacteria break down parts of food that the body cannot digest on its own. This releases nutrients that pass through the intestinal wall into the blood.
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Age 15: open this week
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In the picture
- Rod-shaped bacterium: a gut microbe beside food fragments
- Food fragment: a clump of partly broken-down food
- Intestinal wall: the cell-covered surface lining the gut
- Nutrient dot: a small released nutrient crossing the wall
- Red vessel: a blood channel receiving nutrients beneath the wall
Examples
- Beans and whole grains contain fibers that gut bacteria ferment into useful compounds.
- Yogurt with live cultures adds bacteria that can help process food in the gut.
Key takeaways
- Gut bacteria help unlock energy and nutrients from food.
- Some nutrients must cross the intestinal wall to enter the bloodstream.
Quiz: Gut bacteria at work (Age 15)
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What do gut bacteria help the body do?
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What must nutrients do to enter the bloodstream?
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What is released when gut bacteria break down food?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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