79 results found

Search Results for: channel

Gated ion channel

(Science: physiology) transmembrane proteins of excitable cells, that allow a flux of ions to pass only under defined... Read More

Channel

Channel a furrow, gutter, or groovelike passageway. See: canal. Origin: L. Canalis a bodily passage or tube lined with... Read More

Ligand gated ion channels

Ligand gated ion channel a transmembrane ion channel whose permeability is increased by the binding of a specific ligand,... Read More

Carrier protein

Carrier protein is a type of cell membrane protein involved in facilitated diffusion and active transport of substances out... Read More

Movement of Molecules Across Cell Membranes

Diffusion Diffusion is essentially the movement of molecules from a region of higher concentration to a region of lower... Read More

Axon hillock

Axon Hillock Definition What is axon hillock? If you are familiar with the different parts of the neuron, the axon hillock... Read More

Gutter

Gutter 1. A channel at the eaves of a roof for conveying away the rain; an eaves channel; an eaves trough. 2. A small... Read More

Sarcoplasmic reticulum

Definition noun plural: sarcoplasmic reticula (cell biology) The special type of smooth endoplasmic reticulum found in... Read More

Facilitated diffusion

Facilitated diffusion is the transport of substances across a biological membrane from an area of higher concentration to an... Read More

Hydrogen-transporting ATP synthase

Definition noun A membrane enzyme that allows the diffusion of protons (hydrogen ions) through its proton channel component... Read More

Endomembrane system

Ever wondered how biomolecules are made within the cell and then they are released outside the cell for use by the body?... Read More

Osmosis

Osmosis is the net movement of solvent molecules through a semipermeable membrane. It is similar to diffusion as the... Read More

Concentration gradient

Concentration gradient definition Concentration gradient refers to the gradual change in the concentration of solutes in a... Read More

ATP synthase

Definition noun, plural: ATP synthases An enzyme that catalyzes the formation of ATP from the phosphorylation of ADP with... Read More

Bypass

Bypass 1. A shunt or auxiliary flow. 2. (Science: surgery) to create new flow from one structure to another through a... Read More

Canaliculus

Definition noun, plural: canaliculi (anatomy) Any of many small canals or ducts in the body, such as in the bone, or in some... Read More

Graded potential

Definition noun, plural: graded potentials A change in the electrical potential on the membrane of an excitable cell (e.g. a... Read More

Generation of resting membrane potential

Stephen H. Wright Department of Physiology, College of Medicine, University of Arizona, Tucson, Arizona 85724... Read More

Chemiosmosis

Chemiosmosis Definition What is chemiosmosis? In biology, chemiosmosis refers to the process of moving ions (e.g. protons)... Read More

Shuttle

shuttle 1. An instrument used in weaving for passing or shooting the thread of the woof from one side of the cloth to the... Read More

Plasma membrane

Do all cells have a plasma (or cell) membrane? Yes, all cells have a biological membrane that separates the protoplasm from... Read More

Aqueduct

Aqueduct 1. A conductor, conduit, or artificial channel for conveying water, especially one for supplying large cities with... Read More

Kill

Kill 1. To deprive of life, animal or vegetable, in any manner or by any means; to render inanimate; to put to death; to... Read More

Gate

Gate 1. A way; a path; a road; a street (as in Highgate). I was going to be an honest man; but the devil has this very day... Read More

Environment

Environment Definition What does environment mean? If you mean physical environment, then it is defined as the surrounding... Read More

Ion carrier

Definition noun, plural: ion carriers An ionophore that facilitates transport of ion through a hydrophobic medium, such as... Read More

Penis erection of the

penis, erection of the When the penis fills with blood and is rigid. The penis contains two chambers, called the corpora... Read More

Bass

Bass Origin: a corruption of barse. (Science: zoology) 1. An edible, spiny-finned fish, especially. Of the genera Roccus,... Read More

Organ

Definition noun, plural: organs A group of tissues that perform a specific function or group of functions Supplement An... Read More

Protein

Protein Definition Proteins are biomolecules comprised of amino acid residues joined together by peptide bonds.... Read More

Transmembrane protein

Definition noun, plural: transmembrane proteins A protein that spans the entire biological... Read More

Intrinsic protein

Definition noun, plural: intrinsic proteins Any of the group of integral membrane proteins that facilitate specific... Read More

Streptolysin O

Definition noun An oxygen-labile, immunogenic hemolysin produced by or derived from some strains of... Read More

Light-dependent reaction

Many organisms, such as green plants, convert light energy into chemical energy through the mechanism of photosynthesis. In... Read More

Feathers

Feather 1. (Science: ornithology) One of the peculiar dermal appendages, of several kinds, belonging to birds, as contour... Read More

Passive transport

Passive transport is a type of cellular transport in which substances such as ions and molecules move down their respective... Read More

Semilunar valve

The human heart structure consists of heart chambers (2 atria and 2 ventricles) that differ functionally from each other.... Read More

Simple diffusion

Simple Diffusion Definition What is simple diffusion? In biology, simple diffusion is a form of diffusion that does not... Read More

Connexin 26

Definition noun A gap junction protein that has been regionally specialize structures on plasma membranes of the contacting... Read More