acetylcholine

A man walks down a path that splits into two directions while the sun sets.
| 4 min read
Overlapping profiles of yellow and blue faces are on top of a multicolored striped background.
| 10+ min read
A cartoon shows a silhouette of a human head without a top. Smaller people stand around the head. Most are elevated by ladders and poles and pulling on threads that start in the head and end in question marks.
| 5 min read
On the left, a silhouette of a human body jogs while an electrical heart activity signal extends from its heart. On the right, an anatomical structure of the interior of the heart shows the right atrium, right ventricle, left atrium, left ventricle, sinoatrial node, atrioventricular node, pulmonary artery, aorta, bundle of His, and left and right bundle branches. Arrows show the path of blood flow between the heart chambers.
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