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Type: Multiple-Choice
Category: Respiration, Digestion, and Excretion
Level: Grade 7
Author: Doveydl
Last Modified: 10 days ago

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Respiration, Digestion, and Excretion Question

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Grade 7 Respiration, Digestion, and Excretion

In the alveoli, which gas enters the bloodstream and which gas leaves the bloodstream?
  1. Carbon dioxide leaves and methane enters.
  2. Oxygen leaves and carbon dioxide enters.
  3. Propane leaves and oxygen enters.
  4. Carbon dioxide leaves and oxygen enters.
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