Letter: f

That portion of ingested foodstuffs that cannot be broken down by intestinal enzymes and therefore passes through the colon undigested; good for intestinal health; the thin thread-like structures that combine to form different fabrics and upon which infectious microorganisms may remain alive for many days to weeks.

An elastic, insoluble, whitish protein produced by the action of thrombin on fibrinogen and forming an interlacing fibrous network in the coagulation of blood, the formation of blood clots initiated for any reason. (thrombogenesis)

A long, slender, nerve-free filament that forms the end of the spinal cord.

Fraction of Inspired Oxygen

The optimal type of healing in which the incised tissues heal from side to side with no presence of infection; also called primary union healing.

Horizontal cracks in the skin most notable in irritation reactions.

A fistula is an abnormal connection between an organ, vessel, or intestine and another structure. Fistulas are usually the result of injury or surgery. It can also result from infection or inflammation. Inflammatory bowel disease, such as ulcerative colitis or Crohns disease, is an example of a disease???that leads to fistulas between one loop of intestine and another.

All disposable respirators that rely on a mask-to-face seal need to be annually checked with either qualitative or quantitative methods to determine whether the mask provides an acceptable fit to a wearer. The qualitative fit test procedures rely on a subjective sensation (taste, irritation, smell) of the respirator wearer to a particular test agent. The quantitative fit test uses measuring instruments to measure face seal leakage. The relative workplace exposure level determines what constitutes an acceptable fit and which fit test procedure is required. The quantitative method exposes the wearer to a fine mist of airborne particles, utilizing a detection system to determine the number of particles outside the respirator versus the number that passed into the wearers breathing zone.

A diffuse area of redness on the skin due to increase dilation of the local blood vessels.

A microbe that is able to survive with or without oxygen.