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From SA node firing to ventricular depolarisation takes roughly:

A525 ms
B925 ms
C225 ms
D725 ms
Answer & Solution
Correct answer: C. 225 ms
1. The route includes a deliberate delay. 2. The whole trip is a fraction of a second. 3. It takes about 225 milliseconds. _Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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