I keep getting “Double circulation” questions wrong in Body Fluids and Circulation. What's the trap?
thinking human circulation is single like a fish's.
The usual trap: thinking human circulation is single like a fish's. How to avoid it: two circuits keep oxygenated and deoxygenated blood from mixing. Go back to the definition — blood passes through the heart twice in one cycle -- a pulmonary circuit (heart-lungs) and a systemic circuit (heart-body).
Key point
Double circulation
Common mistake
thinking human circulation is single like a fish's.
Memory tip
two circuits keep oxygenated and deoxygenated blood from mixing.
Tap to watch or see it right here — the app stays open (it only opens a quick search if nothing embeddable is found).