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Haustral contractions are slow segmenting, uncoordinated movements that occur approximately every 25 minutes. One haustrum distends as it fills with chyme , which stimulates muscles to contract, pushing the contents to the next haustrum.
Unlike peristalsis, which predominates in the esophagus, segmentation contractions occur in the large intestine and small intestine, while predominating in the latter. While peristalsis involves one-way motion in the caudal direction, segmentation contractions move chyme in both directions, which allows greater mixing with the secretions of the ...
The gastrocolic reflex or gastrocolic response is a physiological reflex that controls the motility, or peristalsis, of the gastrointestinal tract following a meal. It involves an increase in motility of the colon consisting primarily of giant migrating contractions, in response to stretch in the stomach following ingestion and byproducts of digestion entering the small intestine. [1]
Credit card churning is the process of frequently opening and closing credit cards in order to earn sign-up bonuses and maximize rewards. While this strategy may seem enticing, it can negatively ...
Segmentation in biology is the division of some animal and plant body plans into a linear series of repetitive segments that may or may not be interconnected to each other. This article focuses on the segmentation of animal body plans, specifically using the examples of the taxa Arthropoda , Chordata , and Annelida .
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Segmentation in the hind-brain and paraxial mesoderm is highly regulated by the expression of the Hox gene. Hox genes encode helix-turn-helix transcription factors and play the major role in specifying the positional identities for tissues along the anterior-posterior axis (A-P axis) during the developmental phase.
A segmentation gene is a gene involved in the early developmental stages of pattern formation. It regulates how cells are organized and defines repeated units in the embryo . Segmentation genes have been documented in three taxa: arthropods (i.e. insects and crabs ), [ 2 ] chordates (i.e. mammals and fish ), and annelids (i.e. leeches and ...