Physiology · Cardiovascular System · Medium

Automaticity

Meaning: The ability of certain heart cells to generate electrical impulses spontaneously without external stimulation.

In practice: The sinoatrial node has the highest automaticity and sets the heart rate.

Quick check

Two questions on related physiology words.

Which word means: A stimulus that initiates a physiological response or biochemical cascade.

Which word means: A hormone made by pancreatic alpha cells that raises blood sugar by triggering the liver to release stored fuel.

One medical word a day, then a quick three-question quiz. Free on iPhone, or play in your browser on Android and computer.