The human respiratory system is responsible for gas exchange. Which of the following is the primary site where oxygen enters the bloodstream and carbon dioxide leaves it?

A Trachea

B Bronchi

C Alveoli

D Larynx

✓ Correct Answer: Option C

The alveoli are tiny air sacs in the lungs with very thin walls, surrounded by capillaries. This structure allows for efficient diffusion of oxygen into the blood and carbon dioxide out of the blood.

💡 Why is C) the correct answer?

The correct answer to the question "The human respiratory system is responsible for gas exchange. Which of the following is the primary site where oxygen enters the bloodstream and carbon dioxide leaves it?" is Option C: Alveoli.

The other options — A) Trachea, B) Bronchi, D) Larynx — are incorrect for this GED Exam Prep question. As explained above: The alveoli are tiny air sacs in the lungs with very thin walls, surrounded by capillaries. This structure allows for efficient diffusion of oxygen into the blood and carbon dioxide out of the blood.

📚 About This GED Exam Prep Practice Question

This 2-level GED Exam Prep question from the Science topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free GED Exam Prep practice test or use flashcards for spaced repetition review.

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The human respiratory system is responsible for gas exchange. Which of the following is the primary site where oxygen enters the bloodstream and carbon dioxide leaves it?

✓ Correct Answer: Option C

📚 About This GED Exam Prep Practice Question

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