Why does the signal pause briefly on its way down?
- It lets the lower chambers finish filling
- It stops all blood flow
- It skips the upper chambers
What event makes the sharp tall spike on the trace?
- Upper chambers reset
- Lower chambers squeeze hard
- Nothing happens
Every wiggle on the trace maps to one electrical event in the muscle.
Circle one: True False
You count 5 large squares between two tall peaks. What is the rate per minute?
Answer: ______________
What is the normal path of excitation through the pump?
- Lower chambers first, then upper
- Middle wall first
- Top pacemaker, across uppers, pause, then lowers
The gaps between beats keep changing length. What do you read?
- An uneven rhythm
- A perfectly steady rhythm
- A faster paper speed
A friend says the sharp spike marks the upper chambers. Is that right?
- Yes, spikes always mean upper chambers
- Yes, placement never matters
- No, that spike belongs to the lower chambers
The pause vanishes so lowers squeeze too early. What happens to output?
- Output rises
- Output falls for lack of filling
- Nothing changes
Reading the heartbeat line W1-mt_D-WKFc7BZm-s1
- It lets the lower chambers finish filling · The deliberate hold tops up volume before the big squeeze.
- Lower chambers squeeze hard · The sharp spike is the surface sum of the lower chambers contracting.
- True · Each wiggle is the skin level sum of one electrical event underneath.
- 60 · Rate is 300 divided by the squares between tall peaks, so 300 split 5 ways is 60.
- Top pacemaker, across uppers, pause, then lowers · The top node leads, the wave crosses the upper chambers, holds, then runs down.
- An uneven rhythm · Rhythm comes from regularity, so uneven gaps spell an uneven beat.
- No, that spike belongs to the lower chambers · The first small bump is the upper chambers. The sharp spike is the lowers.
- Output falls for lack of filling · Without the hold the lower chambers squeeze early on a smaller load.