A major innovation from the fish to the amphibian/reptilian circulation is the advent of lungs and allowing no mixing of oxygenated and __________ blood by the help of incomplete divisions of the heart.

Question

Quizplus · Accepted Answer

The advent of lungs allowed for the separation of oxygenated and deoxygenated blood, which was made possible by incomplete divisions of the heart. Therefore, the missing word is "deoxygenated," which refers to blood that has already delivered oxygen to the tissues and now needs to be re-oxygenated in the lungs. Option A (decarbonated) refers to the removal of carbon dioxide from the blood, which is also important for maintaining health, but not relevant to the question. Option B (nitrogenated) is not a commonly used term in physiology and does not accurately describe blood in any way. Option D (hydrogenated) refers to the addition of hydrogen atoms to substances and is not applicable to this context.

A Major Innovation from the Fish to the Amphibian/reptilian Circulation