Thread:Peachy4872/@comment-39062437-20190720185935/@comment-39062437-20190806200129

(They are now in one of the lungs)

Lisa: As we breathe in, our lungs fill up with oxygen from the atmosphere. Then they release the carbon dioxide as we breathe out.

Lincoln: Wow! Now that's something I should write down. (He takes notes)

Lisa: It's also go for the bloodstream, and the most important organ that pumps blood through our body is the heart.

Lincoln: Can we see?

Lisa: Okay. But I must warn you. The beating of the heart is very loud.

(Lisa flies the sub through the bloodstream)