alleryStart learning →Left to itself, the SA node would fire roughly how many times a minute?
A20 to 40
B50 to 70
C10 to 30
D80 to 100
Answer & Solution
Correct answer: D. 80 to 100
1. Nerves usually slow it down.
2. Its own rate is higher than resting pulse.
3. It is about 80 to 100.
_Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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