What is the normal rate per minute of the SA node?

The normal rate of the sinoatrial (SA) node, often referred to as the heart's natural pacemaker, typically ranges from 60 to 100 beats per minute. This rate is considered the baseline for a healthy adult at rest. The SA node initiates the electrical impulses that lead to each heartbeat, setting the rhythm for the entire heart.

When the heart rate exceeds this range, it may indicate conditions such as tachycardia or increased physiological demands, while a rate lower than this can suggest bradycardia or other underlying issues. Thus, understanding that the SA node is responsible for this rate and recognizing its significance in maintaining a normal heartbeat is crucial for any healthcare provider, particularly those in the field of emergency medical services and cardiology. Instead of other choices reflecting alternate rates that typically correspond to other pacemaker sites or pathological states, the correct answer accurately reflects the physiological norms associated with the SA node's function.