contractile tubules
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Contractile vacuole — Protist Paramecium aurelia with contractile vacuoles A contractile vacuole (abbreviation: CV) is a sub cellular structure (organelle) involved in osmoregulation. It is found predominantly in protists and in unicellular algae. It was previously… … Wikipedia
polian villi — see contractile tubules … Dictionary of invertebrate zoology
muscle — muscleless, adj. muscly, adj. /mus euhl/, n., v., muscled, muscling, adj. n. 1. a tissue composed of cells or fibers, the contraction of which produces movement in the body. 2. an organ, composed of muscle tissue, that contracts to produce a… … Universalium
excretion — excretion1 /ik skree sheuhn/, n. 1. the act of excreting. 2. the substance excreted, as urine or sweat, or certain plant products. [1595 1605; < LL excretion (s. of excretio) that which is sifted out. See EXCRETE, ION] excretion2 /ik skree… … Universalium
Cytokinesis — A cell that has almost completed cytokinesis. An arrow points to a centrosome that can still be seen … Wikipedia
Excitation-contraction coupling — Excitation contraction (EC) coupling is a term coined in 1952 to describe the physiological process of converting an electrical stimulus to a mechanical response [1]. This process is fundamental to muscle physiology, whereby the electrical… … Wikipedia
Sarcolemma — The sarcolemma is the cell membrane of a muscle cell. It consists of a true cell membrane, called the plasma membrane, and an outer coat made up of a thin layer of polysaccharide material that contains numerous thin collagen fibrils. At each end… … Wikipedia
renal system — ▪ anatomy Introduction in humans (human body), organ system that includes the kidneys, where urine is produced, and the ureters, bladder, and urethra for the passage, storage, and voiding of urine. In many respects the human excretory, or… … Universalium
circulation — circulable /serr kyeuh leuh beuhl/, adj. /serr kyeuh lay sheuhn/, n. 1. an act or instance of circulating, moving in a circle or circuit, or flowing. 2. the continuous movement of blood through the heart and blood vessels, which is maintained… … Universalium
drug — drug1 /drug/, n., v., drugged, drugging. n. 1. Pharm. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well being. 2. (in federal law) a. any substance… … Universalium
