Arrhythmia Definition. A heart arrhythmia is an irregular heart beat: the beat may be too fast, too slow, or the rhythm may be irregular. Types. Arrhythmias can be classified by their origin (atria or ventricles) and by heart rate. Tachycardia. A fast (over 100 beats per minute) heart rate is called tachycardia.
What are products of the light and dark reactions of photosynthesis? The products of the light reaction are 602, 12 NADPH2 and 18 ATP.    The products of the dark reaction are C6H12O6, 12 NADP, 18 ADP, 18 Phosphates and 6H2O.
Light and dark reactions in photosynthesis Photosynthesis is divided into two parts: 1. Light-dependent reactions (light reactions) 2. Light-independent reactions (dark reactions). Light reactions need light to produce organic energy molecules (ATP and NADPH). They are initiated by colored pigments, mainly green colored chlorophylls.