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The image shows a close-up of a tablet screen displaying a diagram and text about the effects of acetylcholine (parasympathetic) on the heart. The diagram illustrates the pathway from acetylcholinesterase to decreased heart rate. The text above the diagram describes how acetylcholine binds to muscarinic M2 channels in the sinoatrial node (SAN), decreases cAMP, and reduces calcium entry, leading to a slower heart rate. Additional text below the diagram discusses cardiac output modulation and Starling's law of the heart. The tablet is sitting on a dark surface. There are no people visible in the image. The location is not depicted in the image.
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