BISC 101 Week 7 Lecture 1

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Last updated 5:47 AM on 6/27/26
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8 Terms

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The four stages of nutrition/digestion

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The components of the digestive tract

  1. Mouth

  2. Esophagus

  3. Stomach

  4. Small Intestine

  5. Large Intestine

  6. Rectum

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Ingestion

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Digestion

e.g.

Corematodus taeniatus: rougher surface, smaller fishes

Labeotropheus fuelleborni: smoother surface, algae

How does it solve the challenge of eating this food: 

By adapting to digest different foods in their environment

<p>e.g.</p><p><span style="background-color: transparent;">Corematodus taeniatus: rougher surface, smaller fishes<br></span></p><p><span style="background-color: transparent;">Labeotropheus fuelleborni: smoother surface, algae</span><br></p><p><span style="background-color: transparent;">How does it solve the challenge of eating this food:&nbsp;</span></p><p><span style="background-color: transparent;">By adapting to digest different foods in their environment</span></p>
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Absorption

The structure of the small intestine, and how does it absorbs nutrients?

  1. Length

  2. Large Surface Area

  3. Transport proteins

  4. Small diffusion distance (thin membrane)

  5. concentration gradient

  6. villi and microvilli

<p>The structure of the small intestine, and how does it absorbs nutrients?</p><ol><li><p><span style="background-color: transparent;">Length</span></p></li><li><p><span style="background-color: transparent;">Large Surface Area</span></p></li><li><p><span style="background-color: transparent;">Transport proteins</span></p></li><li><p><span style="background-color: transparent;">Small diffusion distance (thin membrane)</span></p></li><li><p><span style="background-color: transparent;">concentration gradient</span></p></li><li><p><span style="background-color: transparent;">villi and microvilli </span></p></li></ol><p></p>
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Elimination: Formation and Excretion of Feces

Large Intestine:

  • Cecum: Connection with small intestine.

  • Colon: Form feces by absorbing additional water and compacting the wastes that remain.

    • Rectum: Storage location for feces until it can be eliminated.

  • Anus: Opening that connects with the environment.

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The kidney

involved in food processing, indirectly,

filters waste from the blood, and regulates salt/water/nitrogen levels.)

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In the 4 steps: What enzymes are active, where?

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