I am currently learning about respiratory system in anatomy and this question is not very clear to me:

moves from blood to alveoli: _______
moves from alveoli to blood: ________

I am thinking it may be carbon dioxide and oxygen respectively, but I am not too sure. Please help!

Yes, I believe that is correct. Check your textbook for gas exchange.

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You are on the right track! The movement of gases between the blood and the alveoli is an essential part of the respiratory system. Here's the answer to your question:

Moves from blood to alveoli: Carbon Dioxide (CO2)
Explanation: During the process of respiration, carbon dioxide is produced as a waste product. It diffuses from the bloodstream into the alveoli in the lungs. This is facilitated by a concentration gradient between the higher concentration of carbon dioxide in the blood and the relatively lower concentration in the alveoli. Ultimately, carbon dioxide is expelled from the body during exhalation.

Moves from alveoli to blood: Oxygen (O2)
Explanation: Breathing in fresh air supplies the alveoli with oxygen. This oxygen diffuses from the alveoli into the bloodstream, where it attaches to hemoglobin molecules within the red blood cells. The oxygenated blood is then transported to the body's tissues, providing the necessary oxygen for cellular respiration.

Understanding the movement of gases in the respiratory system is fundamental in grasping the exchange of oxygen and carbon dioxide that occurs during respiration.