Which condition causes an irregular quivering action of the muscular wall of the atria?
A) atrial fibrillation
B) defibrillation
C) ischemic heart disease
D) ventricular tachycardia
Question 2
Which term means abnormal softening of cartilage?
A) costochondritis
B) chondromalacia
C) chondroma
D) osteochondroma