The final 6-inch section of the large intestine that stores feces before elimination through the anus, containing specialized nerve endings that signal the need for defecation.
From Latin rectum meaning 'straight,' because anatomists noted this section of intestine runs relatively straight compared to the coiled sections above it.
The rectum is incredibly sensitive - it can distinguish between gas, liquid, and solid contents through specialized sensory receptors, which is why you usually know exactly what's coming when you feel the urge to use the bathroom. This amazing discrimination ability is called the 'sampling reflex' and it's something we completely take for granted!
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