591 results found

Search Results for: membrane

Cell membrane

Cell Membrane Definition Just like any non-living body possesses a plastic or paper packaging material that keeps 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

Selectively-permeable membrane

Selectively Permeable Membrane Definition We can define selectively permeable membranes as those that are selectively... 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

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

Generation of resting membrane potential

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

Fluid mosaic model

Fluid Mosaic Model Definition What is the fluid mosaic model? The fluid mosaic model is a three-dimensional representation... Read More

Membrane protein

Definition noun, plural: membrane proteins A type of protein that is attached to, or associated with, a biological... Read More

Membrane

Definition noun, plural: membranes (1) (biology) A thin layer of tissue covering a surface or lining a cavity, space or... Read More

Endoplasmic reticulum

Endoplasmic Reticulum Definition The endoplasmic reticulum is a membrane-bound organelle in cells of eukaryotic cells... Read More

Resting potential

Resting Potential Definition The resting potential of a cell is defined as the difference in electrical potential across... Read More

Fetal membrane

Definition noun, plural: fetal membranes A membrane surrounding the embryo or fetus and is involved in nutrition,... Read More

Integral membrane protein

Definition noun A protein molecule (or assembly of proteins) that is permanently attached or firmly anchored in the plasma... Read More

Peripheral membrane protein

Definition noun, plural: peripheral membrane proteins A protein that temporarily adheres to the biological membrane, either... 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

Sarcolemma

Sarcolemma Definition What is the sarcolemma? It is the thin, transparent, extensible plasma membrane of the muscle cell.... Read More

Cell Structure

The interior of human cells is divided into the nucleus and the cytoplasm. The nucleus is a spherical or oval-shaped... 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

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

Organelle

The cell is regarded as the structural, functional, and biological unit of all organisms. It is a membrane-bound structure... Read More

Chemiosmosis

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

Mitochondrion

Mitochondrion Definition What are mitochondria? The term “mitochondrion” comes from the two words of the Greek... Read More

Undulating membrane

Definition noun A sinuous extension of the cytoplasmic membrane performing a vigorous, wavelike, and reversible... 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

Golgi apparatus

Golgi Apparatus Definition The Golgi apparatus is a membrane-bound organelle in eukaryotic cells. It plays a crucial role... Read More

Pinocytosis

Pinocytosis Definition What is pinocytosis?  Pinocytosis is the ingestion of extracellular fluids, i.e. the fluid... Read More

Synovial membrane

Definition noun, plural: synovial joints The connective tissue lining the inner surface of the joint capsule of a synovial... Read More

Flaccid part of tympanic membrane

Flaccid part of tympanic membrane triangular loose part of tympanic membrane between the malleolar folds. Synonym: pars... Read More

Amphipathic

Amphipathic Definition Amphipathic is a word used to describe a chemical compound containing both polar (water-soluble) and... Read More

Cell wall

The cell is the structural, functional, and biological unit of all organisms. It is a membrane-bound structure containing... Read More

Phospholipid

What is a phospholipid? Phospholipids are a subgroup of lipids. Other major types of lipids are fatty acids, sphingolipids,... Read More

Neural Control Mechanisms

Nerve cells called neurons generate electric signals that pass from one end of the cell to another and release chemical... Read More

Transmembrane protein

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

Endomembrane

Definition noun, plural: endomembranes The membraneous components in a cell, i.e. nuclear envelope, endoplasmic reticulum,... Read More

Rough endoplasmic reticulum

Rough Endoplasmic Reticulum Definition The rough endoplasmic reticulum (rough ER or rER) is a membrane-bound organelle... Read More

Endocytosis

Endocytosis Definition What is endocytosis in biology? Endocytosis is a cellular process by which a cell internalizes any... Read More

Cytokinesis

The cell cycle of eukaryotes is a cyclical series of biological events that certain asexual cells go through. The cell cycle... Read More

Vacuole

A vacuole is a single membrane-bound organelle with no definite shape or size found in both prokaryotic and eukaryotic... Read More

Hypotonic solution

Hypotonic Solution Definition What is a hypotonic solution? It refers to a solution that contains a lower amount of solute... Read More