Fibrin
The activated form of the blood-clotting protein fibrinogen, which aggregates into threads
that form the fabric of the clot.
Fibrillin
Fibrillin is a glycoprotein, which is essential for the formation of elastic fibers found in
connective tissue.
Fibroin
Fibron is a type of protein created by silkworms in the production of silk.
Fibroblast
A type of cell in loose connective tissue that secretes the protein ingredients of the
extracellular fibers.
Fibrous protein
Insoluble structural protein in which the polypeptide chain is coiled along one dimension.
Fibrous proteins constitute the main structural elements of many animal tissues.
Fibula
The outer and narrower of two bones of the human lower leg, extending from the knee to
the ankle.
Filament
A chain of cells.
Filtrate
Fluid extracted by the excretory system from the blood or body cavity. The excretory system
produces urine from the filtrate after extracting valuable solutes from it and concentrating
it.
Filtration
The first stage of kidney function; blood plasma is forced, under pressure, out of the
glomerular capillaries into Bowman's capsule, through which it enters the renal tubule.
Fimbriae
A fringelike anatomical part or structure.
First law of thermodynamics
The principle of conservation of energy. Energy can be transferred and transformed, but it
cannot be created or destroyed.
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