sphincter
circular muscle to close an opening, such as stomach, bladder, or anus
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
sphincter
(sfink-ter) [Gk. sphinkter, a band]
A ringlike valve, consisting of modified muscles in a muscular tube, such as a digestive tract; closes off the tube like a drawstring.
spinal cord ...
Cardiac Sphincter ring of muscles between bottom of esophagus and top of stomach to close off stomach
(cardio = heart; sphinct = bind tight‚ squeeze‚ strangle) ...
pyloric sphincter The ring of muscle at the junction of the stomach and small intestine that regulates the movement of food into the small intestine. PICTURE ...
Sphincter ani externus.
Sphincter ani internus.
The Superficial Fascia."The superficial fascia is very thick, areolar in texture, and contains much fat in its meshes.
sphincter A ringlike band of muscle fibers that constricts a passage or closes a natural orifice.
spice A pungent, aromatic plant product derived from plants native to tropical regions and used to flavor foods.
The iris is a sphincter with pigmented tissue (which makes up the color of the eyes) that contracts to limit the amount of light that can enter through the pupil and relaxes again to allow for better vision in darkness.
gastroesophageal sphincter A ring of muscle at the junction of the esophagus and the stomach that remains closed except during swallowing to prevent the stomach contents from entering the esophagus.
As that hotdog bite falls into the stomach, a round muscle called a sphincter closes behind it. This protects the esophagus from having food or other chemicals splash back into it.
Flow of blood is controlled by structures called precapillary sphincters
Located between arterioles and capillaries
Muscle fibres allow them to contract
Hydrostatic pressure is created by the heart which pumps blood into arteries
At the arteriole end ...
The alimentary canal. Abdominal part of esophagus. Stomach (fig. 27-1, 27-2 and 27-3) ... 27-2 Provide an example of a sphincteric mechanism of the alimentary canal. ...
Full article ...
Smooth muscle lines the blood vessels and all internal organs. It is not under voluntary control (except for the anal sphincter muscle which we learn to control). Connective tissue covers all three types of muscle.
 See also: Human, Muscle, Trans, Class, Organ
  
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