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Physiology
Acetylcholine, released by the vagus nerve, acts on the SA node to slow down the heart rate by hyperpolarizing the membranes of the SA node cells and decreasing their automaticity.
Pathology
1. People with Xeroderma Pigmentosum (XP):
Xeroderma pigmentosum is a rare genetic disorder that affects the way the skin
and eyes repair damage from UV radiation. Individuals with XP have a deficiency
in the DNA repair mechanism that n