第四章血液循环Blood circulation一、心脏泵血的过程和机制 (一)心动周期(Cardiac cycle)定义:心房或心室一次缩和舒张称为心动周期。心动周期与心率呈反比HR 75次/分时,心动周期为08s 心率↑→ 心动周期↓→收、舒皆短,对舒张期缩短程度更大→ 长期心脏衰竭心动周期中心房和心室活动的顺序和时间关系 (二)心脏泵血过程 基本机制: 动力:压力梯度(高→低)血
第二节心脏的电生理学及生理特性 心肌生理特性: 兴奋性(excitability) 自律性(autorhythmicity) 传导性(conductivity) 收缩性(contractility) 心肌细胞分类1、根据电生理特性不同,分:①工作细胞working cell:心室肌细胞 心房肌细胞 有兴奋性、传导性、收缩性,无自律性。②自律细胞autorhythmic cell:
第16部分swing dismayencouragementspeedboat drift buoy water skimood desperately truthmit petrolpanion tremendous inspector trap gently volunteer patience honour object gratitude inform coincidenc
结 束循环条件循环变量的三要素:循环变量的初值终值递增量决定了循环体执行次数称为循环变量的三要素I=I15
第9部分soil detect worthlesscave Benz sound entrance value Rolls-Royce rivalthoroughly downhill trunk excitement jeanswheel speed pastry bury sign seashore persuaderecognizepirate finally gold mess regis
第12部分escape liquid alivemanage persistent climax avoid acquire murder cluster react suppose confidence instruct bull drunk pedal aerial beeswax Congo bone enthusiastimagineviolently hive volcano packi
第13部分horsepowermicrophoneracingobservatory evade truant lorry average dependent record-holder border fan shame unimaginativeshady sheriff hitchhike apparently criticism deaf bow parliament safety chec
第6部分despair rude certaincaller mirror fixhole relativeunsmiling tight globe remark musical remind lighthouse marketcontinuestadiumMediterraneaplain capital design standardcontinually alone followi
第9部分soil detect worthlesscave Benz sound entrance value Rolls-Royce rivalthoroughly downhill trunk excitement jeanswheel speed pastry bury sign seashore persuaderecognizepirate finally gold mess regis
第16部分swing dismayencouragementspeedboat drift buoy water skimood desperately truthmit petrolpanion tremendous inspector trap gently volunteer patience honour object gratitude inform coincidenc
违法有害信息,请在下方选择原因提交举报