I keep getting “Myogenic heart and the SAN” questions wrong in Body Fluids and Circulation. What's the trap?
thinking the brain fires every heartbeat.
The usual trap: thinking the brain fires every heartbeat. How to avoid it: SAN = the heart's built-in pacemaker, so an isolated heart still beats. Go back to the definition — the sino-atrial node, a patch of heart muscle, is the pacemaker that starts each heartbeat on its own.
Key point
Myogenic heart and the SAN
Common mistake
thinking the brain fires every heartbeat.
Memory tip
SAN = the heart's built-in pacemaker, so an isolated heart still beats.
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