文档介绍：心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University第四章血液循环第四章血液循环血液循环血液循环心血管活动的调节血管生理心脏的泵血功能心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University?心脏?心血管系统动、静脉?毛细血管?循环系统?淋巴管道?淋巴系统?淋巴器官?*功能:物质运输、物质交换、维持稳态、?机体防御及免疫、内分泌等。心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University心脏的泵血过程及机制一心输出量与心脏做功二心脏泵血功能的储备三影响心输出量的因素四心功能的评价五心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University1、我们的心脏是怎样工作的???请思考:心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University一、心脏泵血的过程和机制(一)心动周期心动周期(cardiac cycle)心脏一次收缩和舒张构成的一个机械活动周期, 分为收缩期和舒张期。心缩(舒)期****惯以心室的活动作为心脏活动的指标心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University?心率(heart rate,HR):每分钟心脏搏动(心动周期)的次数?正常***HR:60~100次/分。?HR75次/min,每一个心动周期:,心房、心室是怎样活动的? Yi Medical UniversityZun Yi Medical :,心动周期缩短,收缩期与舒张期哪个缩短最为显著?(一)心动周期心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University(二)心脏泵血过程(以左心为例)心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University心动周期中压力变化瓣膜变化容积变化血流变化心血管系统精品课程Zun Yi Medical UniversityZun Yi Medical University1. (1)等容收缩期:(1)等容收缩期:﹥室内压﹤心室容积不变、室内压急剧