148 results found

Search Results for: passage

Alimentary canal

Definition of Alimentary canal What is the alimentary canal? The alimentary canal is a muscular hollow continuous tubular... Read More

Vent

vent To snuff; to breathe or puff out; to snort. Origin: Cf. F. Venter to blow, vent wind (see Ventilate); but prob... Read More

Vestibule

vestibule The porch or entrance into a house; a hall or antechamber next the entrance; a lobby; a porch; a hall. Vestibule... Read More

Permeability

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

Sympatric speciation

Speciation is a process of evolution through which two different existing populations evolve and a distinct species form. It... 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

Bore

Bore 1. To make a hole or perforation with, or as with, a boring instrument; to cut a circular hole by the rotary motion of... Read More

Duct

Duct (Science: anatomy) a passage with well defined walls, especially a tube for the passage of excretions or... Read More

Gorge

The passage between the pharynx and the stomach.gorge 1. The throat; the gullet; the canal by which food passes to the... Read More

Tunnels

tunnel 1. To form into a tunnel, or funnel, or to form like a tunnel; as, to tunnel fibrous plants into nests. 2. To catch... Read More

Fauces

Fauces 1. (Science: anatomy) The narrow passage from the mouth to the pharynx, situated between the soft palate and the base... 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

Meatus

meatus (Science: anatomy) A natural passage or canal; as, the external auditory meatus. Origin: L, a going, passage, fr.... 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

Foramen

Definition noun, plural: foramina, foramens Any opening or perforation, orifice or fenestra, especially through a bone, and... Read More

Nuclear pore complex

Definition noun plural: nuclear pore complexes ˈnu kli ər, pɔː ˈkɒmplɛks A complex of nucleoporins resulting in the... Read More

Tissue

Tissue Definition What is tissue in the body? The body tissue is an aggregation of cells that function together and have a... Read More

Dead Man Walking

Dead Man Walking: Wade Davis and the Secret of the Zombie Poison By Patrick D. Hahn Accepted on September 4, 2007 Twenty... Read More

Sound

sound The air bladder of a fish; as, cod sounds are an esteemed article of food. Origin: AS. Sund a swimming, akin to E.... Read More

Circulation

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

Nuclear envelope

Definition noun plural: nuclear envelopes nu·cle·ar en·ve·lope, ˈn(j)ukliɚ ˈɛn.və.ləʊp The two layered membrane... Read More

Nuclear pore

Definition noun plural: nuclear pores ˈnu kli ər, pɔː Any of the many perforations on the nucleus as a result of the... Read More

Osmosis

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

Blood-brain barrier

Definition noun A semipermeable membrane that serves as a selective barrier separating the circulating blood and the... Read More

Electrical synapse

Definition noun A form of synapse between two apposed neurons in which nerve impulse transmission is rapid and occurs by... Read More

Slide

slide 1. The act of sliding; as, a slide on the ice. 2. Smooth, even passage or progress. A better slide into their... Read More

Ras

ras (Science: oncogene) One of a family of oncogenes, first identified as transforming genes of harvey and Kirsten murine... Read More

Cell membrane permeability

Cell membrane permeability a quality of cell membranes which permits the passage of solvents and solutes into and out of... Read More

Choanate

Choanate Having a funnel, i.e., with a ring or collar. Choanate- passage from the external nostrils to the mouth cavity for... 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

Kidney calices

Definition noun, singular: kidney calyx Funnel-shaped structures that allow passage of the urine from the ducts of the renal... Read More

Sturms conoid

Sturm's conoid In optics, the pattern of rays formed after passage through a spherocylindrical... 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

Osteoporosis

Definition noun, plural: osteoporoses A disease of bone in which the bones become extremely porous and are subject to... Read More

Scalene hiatus

scalene hiatus triangular gap bounded by the scalenus anterior and scalenus medius muscles and the first rib to which the... Read More

Ostium

Ostium Origin: L. (Science: anatomy) An opening; a passage. An opening in organic sponges that allow water to enter the... Read More

Amphipathic

Amphipathic is a word used to describe a chemical compound containing both polar (water-soluble) and nonpolar (not... Read More

Anastomosis

Definition noun, plural: anastomoses (1) Interconnection between parts of a branching system forming a network, as in leaf... Read More

Mutagen

Mutagen Definition What is a mutagen? A mutagen is a substance or agent that causes DNA impairment that results in the... Read More