心血管调节.ppt
《心血管调节.ppt》由会员分享,可在线阅读,更多相关《心血管调节.ppt(31页珍藏版)》请在得力文库 - 分享文档赚钱的网站上搜索。
1、心血管调节现在学习的是第1页,共31页现在学习的是第2页,共31页 现在学习的是第3页,共31页Baroreceptor Reflex现在学习的是第4页,共31页Fig 2现在学习的是第5页,共31页Figure 2:Arterial mechanoreceptors of the carotid sinus and aortic arch.The nerve fibers from the carotid sinus form the sinus nerve,which joins the vagus and sympathetic to form the vagosympathetic t
2、runk.The afferent fibers from the receptors are myelinated(-)and unmyelinated(-).The nerves terminate in the solitary tract nucleus.Changes in the activity of those mechanoreceptors caused by alterations in the arterial blood pressure result in appropriate adjustments in the vagal and sympathetic ou
3、tflow to the heart,and the sympathetic outflow to the resistance and capacitance vessels.These adjustments buffer changes in the arterial blood pressure.NE=norepinephrine.Ach=acetylcholine.SA=sinus node.AV=atrioventricular node.(Redrawn from Shepherd and Vanhoutte.The Human Cardiovascular System Fac
4、ts and Concepts.Raven Press,1979.)现在学习的是第6页,共31页FIGURE 1 现在学习的是第7页,共31页现在学习的是第8页,共31页FIGURE 5现在学习的是第9页,共31页Figure 5:Hemodynamic effects of a decrease in activity of the mechanoreceptors in the carotid sinus,aortic arch,and cardiopulmonary region.The continuous inhibition of the solitary tract nucleu
5、s in the medulla of the brain is lessened,and there is increases sympathetic outflow to the heart and blood vessels and decreased vagal activity to the heart.The constriction of the systemic vascular beds results in an increase in total systemic vascular resistance.The cardiac output is maintained b
6、y the increased rate and contractility,and maintenance of its filling pressure by the reflex constriction of the systemic veins.The coronary flow is increased bt the increased products of metabolism of the myocardial cells and by activation of beta-receptors.The systolic and diastolic pressures are
7、increased so an adequate perfusion pressure to the brain and coronary vessels is sustained.If the decreased pressure is due to hemorrhage,the cardiac output decreases in spite of the increase in rate and contractility because the venoconstriction is unable to provide an adequate filling pressure owi
8、ng to the continuing blood loss.ACh=acetylcholine.NE=norepinephrine.PRU=peripheral resistance units.(Redrawn from Shepherd and Vanhoutte.The Human Cardiovascular System Facts and Concepts.Raven Press,1979.)现在学习的是第10页,共31页 Figure 6:Regulation of Mean Systemic Arterial Pressure现在学习的是第11页,共31页Constrict
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 心血管 调节
限制150内