peristaltikou

Peristaltikou refers to peristalsis or peristaltic processes, typically described in biology and medicine. The term derives from Greek, with peristaltikos meaning related to a wave-like propulsion. It is used to characterize the coordinated muscular contractions that move contents through hollow organs.

Peristaltic action results from sequential contractions of circular and longitudinal smooth muscle in the walls of tubular organs. A wave of constriction travels along the tract, behind the advancing content; at the same time, the relaxed region ahead allows forward movement. This process is orchestrated by the enteric nervous system, particularly the myenteric plexus, and modulated by autonomic input. Pacemaker cells in the gut set a basic rhythm, while neurotransmitters such as acetylcholine promote contraction and others such as nitric oxide promote relaxation in different regions.

In the human body, peristaltic waves occur throughout the digestive tract, beginning in the esophagus where swallowing triggers primary peristalsis to move a bolus toward the stomach. The stomach, small intestine, and colon use peristalsis to propel contents and mix them with secretions. Peristaltic-like contractions also occur in the ureters to transport urine to the bladder, and in the fallopian tubes to assist movement of gametes toward the uterus. Similar rhythmic movements can be observed in other animals and in certain parts of the reproductive and urinary systems.

In medicine and engineering, peristaltic concepts are significant. Disorders of motility, such as ileus or gastroesophageal motility disorders, reflect disruptions to peristaltic coordination. Peristaltic pumps, which compress flexible tubing with rollers to produce flow, are widely used in laboratory and clinical settings for sterile, contamination-free transport of liquids.