[Verse 1]
Alright, the colon's got a job that's underrated, people sleep on it
Absorbing water, sodium, keeping the body's balance exquisite
Bacteria fermenting fibre, short-chain fatty acids minted fresh
Butyrate fueling colonocytes, propionate doing the rest
Acetate hits the bloodstream, systemic energy supplied
Ninety percent of luminal water pulled to the inside
Sodium cotransport, aldosterone amplifying the pull
Without this segment functioning, you'd never feel full
[Chorus]
Segmentation, mass movement, gastrocolic reflex fires
Rectoanal inhibitory — the sphincter that enquires
Puborectalis slings the angle, continence maintained
Sampling, compliance, consistency — the system is explained
Remember SMGR — Segmentation, Mass, Gastrocolic, Reflex
Colonic physiology, nothing more complex
[Verse 2]
Motility's a two-part act, segmentation chops and churns
Mixing contents, maximising contact while absorption earns
Then mass movements — powerful, propulsive, three times daily
Gastrocolic reflex triggers them post-meal, never fails me
Eat a meal, the colon wakes, peristaltic rush descends
High-amplitude propagating contractions round the bends
Enteric nervous system, serotonin setting pace
Slow transit, fast transit — motility defines the case
[Chorus]
Segmentation, mass movement, gastrocolic reflex fires
Rectoanal inhibitory — the sphincter that enquires
Puborectalis slings the angle, continence maintained
Sampling, compliance, consistency — the system is explained
Remember SMGR — Segmentation, Mass, Gastrocolic, Reflex
Colonic physiology, nothing more complex
[Verse 3]
Defecation — the rectum fills, compliance buffers pressure rising
Internal sphincter smooth muscle relaxes, almost surprising
That's the RAIR — rectoanal inhibitory reflex at the gate
Samples the content, solid gas or liquid, determines fate
External sphincter voluntary, striated under pudendal control
Puborectalis releases its angle, opening up the whole
Valsalva builds the pressure, pelvic floor descends
Coordinated evacuation — that's where the process ends
[Bridge]
Now continence is a coalition, not a single wall
Internal sphincter handles eighty percent of resting haul
External sphincter, puborectalis, sensation stitched together
Stool consistency ties it all — loose stool tests the tether
Damage any layer — nerve, muscle, mucosa's read —
And the architecture crumbles, leakage guaranteed