Any of the colorless blood cells of the immune system including the neutrophils, lymphocytes, monocytes, eosinophils, basophils, and their derivatives.
An insoluble fibrous protein of vertebrates that is the chief constituent of the fibrils of connective tissue (as in skin and tendons) and of the organic substance of bones and yields gelatin and glue on prolonged heating with water.
(Two Words) Translucent bluish-white cartilage with the cells embedded in an apparently homogeneous matrix present in joints and respiratory passages and forming most of the fetal skeleton.
A phagocytic tissue cell of the immune system that may be fixed or freely motile, is derived from a monocyte, functions in the destruction of foreign antigens (as bacteria and viruses), and serves as an antigen-presenting cell.
Lacking continuity or regularity of occurrence, activity, or function.
(Two Words) Any of various polysaccharides derived from an amino hexose that are constituents of mucoproteins, glycoproteins, and blood-group substances —also called mucopolysaccharide.
A usually clear coagulable fluid that passes from intercellular spaces of body tissue into the lymphatic vessels, is discharged into the blood by way of the thoracic duct, and resembles blood plasma in containing white blood cells and especially lymphocytes but normally few red blood cells and no platelets.
A connective-tissue cell of mesenchymal origin that secretes proteins and especially molecular collagen from which the extracellular fibrillar matrix of connective tissue forms.
Recurring or functioning at fixed or normal intervals.
The fluid that circulates in the heart, arteries, capillaries, and veins of a vertebrate animal carrying nourishment and oxygen to and bringing away waste products from all parts of the body.
Of, relating to, or consisting of areolar tissue.