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During ejaculation, the smooth muscle in the walls of the vas deferens contracts reflexively, thus propelling the sperm forward. This is also known as peristalsis . [ 11 ] The epithelial sodium channel ENaC is strongly expressed in smooth muscle cells of the vas deferens. [ 1 ]
Normal blood vessel (left) vs. vasodilation (right) Vasodilation, also known as vasorelaxation, is the widening of blood vessels. [1] It results from relaxation of smooth muscle cells within the vessel walls, in particular in the large veins, large arteries, and smaller arterioles. [2]
Anatomy is often described in planes, referring to two-dimensional sections of the body. A section is a two-dimensional surface of a three-dimensional structure that has been cut. A plane is an imaginary two-dimensional surface that passes through the body.
In vertebrates, the circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the body. [1] [2] It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels (from Greek kardia meaning heart, and Latin vascula meaning vessels).
Meaning Origin language and etymology Example(s) bacillus: rod-shaped Latin baculus, stick Bacillus anthracis: bacteri-Pertaining to bacteria: Latin bacterium; Greek βακτήριον (baktḗrion), small staff bacteriophage, bactericide: balan-of the glans penis or glans clitoridis: Greek βάλανος (bálanos), acorn, glans balanitis: bas-
Blood vessels are the tubular structures of a circulatory system that transport blood throughout a vertebrate's body. [1] Blood vessels transport blood cells, nutrients, and oxygen to most of the tissues of a body.
The word hemodynamics (/ ˌ h iː m ə d aɪ ˈ n æ m ɪ k s,-m oʊ-/ [40]) uses combining forms of hemo-(which comes from the ancient Greek haima, meaning blood) and dynamics, thus "the dynamics of blood". The vowel of the hemo-syllable is variously written according to the ae/e variation.
This position provides a definition of what is at the front ("anterior"), behind ("posterior") and so on. As part of defining and describing terms, the body is described through the use of anatomical planes and anatomical axes. The meaning of terms that are used can change depending on whether an organism is bipedal or quadrupedal.