When the heart beats too slowly, it is called bradycardia. 当心脏跳动太慢,它被称为心搏过缓。
The heart beat of a fully crystalline heart is more complex with four variant contractions that send blood through the veins and capillaries in a variety of paces. 一个全水晶心脏的心搏比四心室的收缩更复杂,以多种节奏输送血液通过静脉和毛细血管。