53 results found

Search Results for: permeable

Selectively-permeable membrane

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

Semipermeable membrane

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

Permeable

Definition adjective Capable of being permeated or passed through, used especially of substances where fluids can penetrate... 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

Cell membrane

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

Homeostasis of Organism Water Regulation

Osmoregulation Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the... Read More

Permeability

Permeability Definition What is permeability? In earth science, its definition is this: "the ability of any material such... Read More

Biological Cell Introduction

It only takes one biological cell to create an organism. In fact, there are countless species of single-celled organisms,... Read More

Tight junction

What are tight junctions? Tight junctions are the intercellular barrier between two neighboring endothelial and epithelial... Read More

Hyperosmotic

Hyperosmotic Definition What is hyperosmotic? The word hyperosmotic is derived from two Greek words: 'hyper', meaning... Read More

Generation of resting membrane potential

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

Arthropod

Arthropod Definition What is an arthropod? An arthropod is an invertebrate living organism characterized by the presence of... Read More

Water in Plants

The movement of molecules, specifically water and any solutes, is vital to understand in light of plant processes. This will... Read More

Osmotic Potential

Definition noun (1) The potential of water molecules to move from a hypotonic solution (more water, less solutes) to a... 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

Circulation

Blood Blood is composed of a liquid, plasma, and blood cells such as erythrocytes (red blood cells,) leukocytes (white... Read More

Plant cell

Plant Cell Definition A plant cell refers to any cell of a plant. It is the structural and functional unit of plants. Plant... Read More

Simple squamous epithelium

Simple Squamous Epithelium Definition Simple squamous epithelium, also known as simple squamous epithelial tissue or... Read More

Osmotic pressure

Definition noun A hydrostatic pressure caused by a difference in the amounts of solutes between solutions that are... Read More

Phospholipid bilayer

Definition noun The two layers of phospholipids arranged in such a way that their hydrophobic tails are projecting inwards... Read More

Thistle tube

Definition noun A piece of glassware used in laboratory that consists of tube with funnel-like portion at the top and a... Read More

Simple diffusion

Diffusion is essential in the anatomy and physiology of a living thing, especially with regard to homeostasis. It is one of... Read More

Chemiosmotic coupling

Definition noun The process that couples or links the electron transport chain to ATP synthesis. Supplement Chemiosmosis is... Read More

Isotonic

Isotonic Definition What does isotonic mean? The term "isotonic" is used in physiology, anatomy, and physical chemistry.... Read More

Chemiosmosis

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

Light-dependent reaction

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

Turgor pressure

In biology, turgor pressure pertains to the pressure that is exerted by the fluid (e.g. water) against the cell wall. It is... Read More

Hyposmotic

Definition adjective 1. Of, relating to, or characterized by having a lower osmotic pressure than a surrounding fluid under... 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

Selective permeability

Definition noun A feature and a function of the plasma membrane that is essential to maintain homeostasis by regulating the... Read More

Mitochondrion

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

Diffusion

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

Fluid mosaic model

Definition A model conceived by S.J. Singer and Garth Nicolson in 1972 to describe the structural features of biological... Read More

Suppurative inflammation

Definition noun A type of inflammation accompanied by the discharge of purulent exudate (pus) Supplement Inflammation is a... Read More

Amphipathic

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

Vasopressin

Definition noun, plural: vasopressins An antidiuretic peptide hormone produced by the magnocellular and the parvocellular... Read More