43 results found

Search Results for: white substance

White substance

white substance --> white matter (Science: anatomy) brain tissue composed of myelin-coated nerve cell fibres. White... Read More

Nervous System

    THE is the most complicated and highly organized of the various systems which make up the human body. It is the... Read More

Monocyte

Monocytes Definition Monocytes are a subset of white blood cells (WBCs) or leukocytes that originate in the bone marrow.... Read More

Phagocytosis

Phagocytosis Definition Phagocytosis is a basic physiological cellular process wherein a cell ingests a solid particle... Read More

Natural selection

Natural Selection Definition What is natural selection in biology? Natural selection is defined as a process in nature... Read More

Unconditioned stimulus

An unconditioned stimulus inherently triggers an automatic response, not reliant on deliberate prior learning. In contrast... Read More

Chlorophyll

Why are most plants green? Have you ever had the same question? Perhaps, you’ve been told that the plants are green... 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

Milk

milk 1. (Science: physiology) A white fluid secreted by the mammary glands of female mammals for the nourishment of their... Read More

Hyaline cartilage

Hyaline Cartilage Definition Before we define hyaline cartilage, let us understand what cartilage is. What is cartilage? Is... Read More

Endocytosis

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

Oxidation

Oxidation Definition How do we define oxidation? There are several definitions of the oxidation process. Oxidation can be... Read More

Egg white

Definition ''noun' The white or clear, gelatinous substance surrounding the egg yolk. Supplement The egg white serves to... Read More

Matter

Definition noun, plural: matters (1) The material of the universe, especially one that occupies space and has mass (2) The... Read More

Pearl

pearl 1. (Science: marine biology, zoology) A shelly concretion, usually rounded, and having a brilliant luster, with... Read More

Pathobiology of allergy and its most severe form, anaphylaxis

When allergy season looms, some people with serious hypersensitivity to allergens tend to be apprehensive of what may come.... Read More

Soap

soap A substance which dissolves in water, thus forming a lather, and is used as a cleansing agent. Soap is produced by... Read More

Fibrocartilage

What Is Fibrocartilage? Fibrocartilage is the strongest transitional connective tissue made up of collagen fibers and... Read More

Cytokinin

Plants require growth hormones for their regulated growth. Plant growth hormones or regulators (PGRs) are small organic... Read More

Spongy bone

Spongy bone, also known as cancellous bone or trabecular bone, is a type of bone tissue found at the ends of long bones and... Read More

Myelin

Definition noun A substance comprised mainly of fatty material (about 80%) and proteins (about 20%), and forms the myelin... Read More

Glycogen

Definition noun plural: glycogens gly·co·gen, glī′kə-jən A multi-branched polymer of glucose, mainly produced in... Read More

Dense connective tissue

Definition noun A type of connective tissue that contains chiefly of collagen fibers (type I collagen) relative to the... Read More

Element

Element Definition noun plural: elements el‧e‧ment, ˈel.ɪ.mənt (biochemistry) A substance that cannot be... Read More

Tropic

tropic 1. (Science: suffix) A turning toward, having an affinity for. Compare: -trophic. Origin: G. Trope, a turning 2.... Read More

Dense regular connective tissue

The dense connective tissue is a type of connective tissue proper that consists predominantly of fibers, especially type I... Read More

Achromatic

Achromatic (Science: microscopy) Literally, colour-free. A lens or prism is said to be achromatic when corrected for two... Read More

Saturation

saturation 1. The act of saturating, or the state of being saturating; complete penetration or impregnation. 2. (Science:... Read More

Characteristic

Characteristics Definition We can define characteristics as qualities or features that describe the distinctive nature or... Read More

Pyrogen

Definition noun, plural: pyrogens A substance inducing fever by acting on the hypothalamic thermoregulatory center and... Read More

Antigen

Antigen Definition What is an antigen? A simple definition is that an antigen refers to any substance that triggers an... Read More

Trehalose

Definition noun plural: trehaloses tre·ha·lose, loʊs A disaccharide made up of two α-glucose molecules, and serves as... Read More

Endoplasmic reticulum

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

Examples of Natural Selection

Reviewed by: Mary Anne Clark, Ph.D. Darwin's Finches Darwin's finches are an excellent example of the way in... Read More

Phenol

phenol (Science: chemistry) 1. A white or pinkish crystalline substance, C6H5OH, produced by the destructive distillation of... Read More

Myocardium

Myocardium Definition What is the myocardium of the heart?  It is the muscular middle layer of the heart that is... Read More

Wrinkles

wrinkle 1. A small ridge, prominence, or furrow formed by the shrinking or contraction of any smooth substance; a... Read More

Lanugo

What is Lanugo? Lanugo is the delicate and downy hair that covers a fetus within the uterus (womb). It is very fine hair.... Read More

Circulation

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

Hemolysis

The breakdown or catabolism of red blood cells or erythrocytes that result in the expulsion of hemoglobin and other... Read More