An immediate and short-lived, usually severe reaction in which the body responds to what is perceived to be a foreign substance with exaggerated symptoms, such as extreme itching, swelling, and often life-threatening respiratory   more »

Reconstitution The restoration to original form of a substance previously altered for preservation and storage Reflex An involuntary response of the nervous system to a stimulus, such as the stretch reflex, which is elicited by tapping a tendon with a reflex hammer, resulting in a contraction. Increased, diminished, or absent reflexes can   more »

Paraparesis Weakness of the lower extremities (legs). Paraplegia Paralysis of both lower extremities (legs). Paresis Partial or incomplete   more »

Necrosis Death or decay of tissue that results from loss of the blood supply and oxygen needed to keep tissue alive and healthy. Nerve A bundle of nerve fibers (axons). The fibers are either afferent (leading toward the brain and serving in the perception of sensory stimuli of the skin, joints, muscles, and inner   more »

Lesion Damaged area in the brain or spinal cord caused by demyelination (also called plaque or sclerosis). Leukocyte White blood cell. Lymphocyte A type of white blood cell that   more »