Colonic Transit
Colonic Transit - Related Videos
02:31
Phase Transitions
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2020
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
03:20
Electrophysiological Recording from Colonic Afferent Nerves in an Ex Vivo Rat Colon
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2025
This video demonstrates a method to record the activity of colonic afferent nerves in an ex-vivo rat colon, cannulated at both ends and infused with saline to increase intraluminal pressure. As pressure increases, the nerve signal rises, indicating its stimulation.
06:16
Cryosectioning Method for Microdissection of Murine Colonic Mucosa
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Cited by 5 •
2015
Here we describe a simple method for the isolation of spatially distinct murine colonic epithelial surface cells from the underlying crypt-base cells.
01:58
Cooperative Allosteric Transitions
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2020
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
02:58
Properties of Transition Metals
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2020
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals. Figure 1: Periodic Table. The transition metals are located in groups 3–11 of the periodic table. The inner transition metals are in the two rows...
FAQs
Segmental contractions repeatedly redistribute intestinal contents within the colon, supporting mixing and allowing time for water absorption. High-amplitude mass movements act more intermittently and provide stronger forward propulsion toward the rectum. The distinction matters clinically because effective bowel function requires both local processing and coordinated longer-range movement rather than continuous propulsion alone.
These regulatory systems coordinate the timing and strength of colonic contractions. Enteric nerves help organize activity within the bowel, while autonomic input and gut hormones contribute broader control of motility. Their combined action links propulsion, mixing, and the timing of distal movement, helping explain why disrupted regulation can produce bowel dysfunction.
Transit determines how long intestinal contents remain exposed to colonic water absorption and how quickly material advances toward the rectum. Changes in movement patterns can therefore alter the balance between processing and propulsion, affecting stool consistency and when contents become available for defecation. These relationships connect motility measurements with everyday bowel symptoms.
Transit measurement provides an objective assessment of how intestinal contents move through the colon. Clinicians can use the resulting findings to help distinguish slow-transit constipation from other causes of bowel dysfunction, rather than relying only on reported bowel habits. This distinction supports a more targeted evaluation of suspected motility disorders.
The main purpose is to characterize colonic movement in patients with suspected bowel motility problems. Findings show whether passage is abnormally slow and help clinicians separate slow-transit constipation from other bowel dysfunction. In medicine, this information contributes to diagnostic evaluation and can support decisions about the most appropriate treatment approach.
Transit findings provide physiological information that complements the clinical assessment of constipation. When results indicate slow passage through the colon, they support consideration of management directed toward a motility-related problem; when they do not, clinicians can investigate other explanations for bowel dysfunction. Thus, measurement helps align treatment selection with the observed transit pattern.