27 results found

Search Results for: facilitated diffusion

Facilitated diffusion

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

Diffusion

Diffusion Definition Diffusion is the net passive movement of molecules or particles from regions of higher to regions of... 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

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

Passive transport

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

Concentration gradient

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

Transport

In biology, transport refers to the act or the means by which a molecule or ion is moved across the cell membrane or via the... Read More

Uniport

Definition noun The transport of molecule or ion across a membrane through facilitated diffusion without coupling to the... 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

Digestion and Absorption of Food

The gastrointestinal (GI) system includes the gastrointestinal tract (mouth, pharynx, esophagus, stomach, small intestine,... Read More

Cell membrane

Definition noun plural: cell membranes ˈmembɹeɪn The cell’s outer membrane made up of a two layers of phospholipids... Read More

Fructose

Definition noun plural: fructoses fruc•tose, ˈfɹʊk.toʊs A ketohexose monosaccharide with a chemical formula of... Read More

Glucose

Glucose occurs naturally and is ubiquitous. It is one of the three most common monosaccharides; the other two are fructose... Read More

Partially-permeable membrane

Definition noun A membrane that is selectively permeable, i.e. being permeable to only certain molecules and not to all... Read More

Selectively-permeable membrane

Definition noun A membrane that is selectively permeable, i.e. being permeable to only certain molecules and not to all... Read More

Transportase

transportase --> transport protein (Science: protein) A class of transmembrane protein that allows substances to cross... Read More

Semipermeable membrane

Definition noun A membrane that is selectively permeable, i.e. being permeable to only certain molecules and not to all... Read More

Regulation of Organic Metabolism, Growth and Energy Balance

Organic Metabolism Events of Absorptive and Post-absorptive States. The absorptive state is the period during which... Read More

Electrogenic

Creating a net flow of charge. For example, the Na-K atpase, ca atpase, or most ion channels involved in facilitated... Read More

Sugar

Definition noun plural: sugars sug·ar, ˈʃʊɡɚ (1) Any monosaccharide or disaccharide, used especially by organisms... Read More

Symport

symport (Science: cell biology, physiology) A mechanism of transport across a membrane in which two different molecules move... Read More

Channel forming ionophore

Definition noun An ionophore forming a channel from where ions can pass through a hydrophobic medium, such as the interior... Read More

Polysaccharide

Reviewed by: Todd Smith, PhD Polysaccharide Definition noun plural: polysaccharides pol·y·sac·cha·ride,... Read More

Chemiosmosis

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

Carbohydrate

Carbohydrate Definition A biomolecule refers to any molecule that is produced by living organisms. As such, most of them... Read More

Permease

permease (Science: enzyme) general term for a membrane protein that increases the permeability of the plasma membrane to a... Read More