264 results found

Search Results for: concentration

Concentration gradient

What is a concentration gradient? A gradient is a measure of how steep a slope is. Thus, a concentration gradient would be... Read More

First-order kinetics

What is a First-Order Kinetics (First-Order Reaction)? First-order kinetics refers to a reaction wherein the overall rate... Read More

Concentration

Definition noun (1) The measure of the amount of a sub-component (especially solute) in a solution (2) The ratio of the mass... Read More

Hypertonic solution

Hypertonic Solution Definition Hypertonic solution is a relative term that describes the solution having a higher amount of... Read More

Hypotonic

Hypotonic Definition Hypotonic is a term used to describe an entity being in the state of hypotonicity. Hypotonicity refers... Read More

Isotonic

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

Diffusion

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

Hypertonic

Hypertonic Definition Hypertonic is a term used to describe an entity being in the state of hypertonicity, where there is a... 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

Vmax

Vmax Definition Vmax is the maximal reaction rate or velocity of an enzymatically catalyzed reaction when the enzyme is... 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

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

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

Carrier protein

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

Plant Water Regulation

A plant requires water as an essential ingredient of photolysis, the photochemical stage of photosynthesis where water is... Read More

Osmosis

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

Critical concentration

Critical concentration (Science: chemistry) The minimum concentration of units needed before a biological polymer will... 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

Active transport

Active transport is a type of cellular transport in which substances (e.g. ions, glucose, and amino acids) are transported... Read More

Protein Activity and Cellular Metabolism

Protein Binding Sites The ability of various molecules and ions to bind to specific sites on the protein surface forms the... Read More

Kidneys and Regulation of Water and Inorganic Ions

Renal Functions Kidneys remove/add substances from/to the plasma.Regulate water concentration, inorganic ion... Read More

Saline solution

Saline Solution Definition Saline solution is one the most medically-used solution, which contains sodium chloride... Read More

Flaccid

Flaccid Definition Biology – What is Flaccid? In botany, the term flaccid refers to a cell that lacks turgidity, i.e. it... Read More

Osmotic pressure

Osmotic Pressure Definition Osmotic pressure is the pressure caused by a difference in the amounts of solutes (or... Read More

Animal Water Regulation

Homeostatic control, a set environment, and how evolution and natural selection drives a species to adapt to its environment... Read More

Peak plasma drug concentration

peak plasma drug concentration (Science: pharmacology) The highest level of drug that can be obtained in the blood usually... 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

Photosynthesis

Photosynthesis is a physio-chemical process carried out by photo-auto-lithotrophs by converting light energy into chemical... 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

Chemical Composition of the Body

In order to fully understand the mechanisms of human physiology, it is important to have an understanding of the chemical... Read More

Hyperosmotic

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

Apical Dominance

a condition where vertical growth supercedes lateral growth in a plant. this is controlled by auxins, where in high... Read More

Biuret test

In this article we will answer the following three questions: What is a Biuret Test?  What does biuret test for? What is... Read More

Muscle

Muscle cells are specialized to generate force and movement. There are three types of muscle tissue: (1) skeletal muscle,... Read More

Turgidity

Turgidity Definition Turgidity is the state of being turgid or swollen, especially due to high fluid content. In a general... Read More

Generation of resting membrane potential

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

Respiration

Organization of the Respiratory System Each lung is composed of air sacs called alveoli - the sites of gas exchange with... Read More

Third-order kinetics

third-order kinetics (Science: pharmacology) A term describing the reaction rate of a chemical reaction in which the rate... Read More

Homeostasis

Homeostasis is the tendency not to stray from the range of favorable or ideal internal conditions. Such conditions must be... Read More