Peristalsis
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Peristalsis is a type of gut motility, characterized by radially symmetrical contraction and relaxation of muscles that propagate in a wave down a tube, in an anterograde direction. Peristalsis is pro
A time-space diagram of a peristaltic wave after a water swallow. High-pressure values are red, zero pressure is blue-green. The ridge in the upper part of the picture is the high pressure of the upper esophageal sphincter which only opens for a short time to let water pass.
A simplified image showing Earthworm movement via peristalsis
Vas deferens
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The vas deferens, ductus deferens, or sperm duct is part of the male reproductive system of many vertebrates. In mammals, spermatozoa are produced in the seminiferous tubules and flow into the epididy
Peristalsis
…via compression during contraction of adjacent skeletal muscle or via arterial pulsation. During ejaculation, the smooth muscle in the walls of the vasa deferentia contract reflexively in peristalsis, propelling sperm from the testicles to the urethra. The earthworm is a limbless annelid worm with a hydrostatic…
3D medical illustration showing vas deferens.
Male reproductive system.
Prostate
Microscopic cross section.