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QRS complex

The QRS complex is a group of deflections in an electrocardiographic (ECG or EKG) tracing that represent the depolarization of the ventricles of the heart, which initiates contraction of the ventricles.

Quadriceps

The quadriceps is one of the great extensor muscles of the legs, running from the front of the thigh to the knee. It acts to extend the leg and to flex the thigh.

Quadriceps femoris

The quadriceps femoris is a muscle of the thigh which acts to extend the leg and to flex the thigh.

Quail

A quail is a small, short-tailed chickenlike bird found in the wild.

Quarantine

Quarantine is the enforced isolation or restriction of free movement imposed to prevent the spread a contagious disease.

Quasi-steady

Quasi-steady means seemingly, but not actually, a steady state of movement.

Quiescent

Quiescent means to be still or inactive; dormant.

Quinidine

Quinidine is an antidysrhythmic agent used as a bisulfate, gluconate, polygalacturonate, or sulfate. It is prescribed in the treatment of atrial flutter, atrial fibrillation, premature ventricular contractions, and tachycardias.