《生理学》CHAPTER 4 CIRCULATI-8.ppt

文档介绍：SECTION 3 VASCULAR PHYSIOLOGY
Ⅰ. Functional properties of  different blood vessels 1. Artery:  Aorta and large artery Pressure reservoir vessels
reservoir vessels:
Systole: store of energy
↑
Elastic fiber elasticity
Stretched

Distensibility Distole: release of energy

recoil maintain distolic←→ic energy
elastic reservoir pressure

intermittent flow → continuous flow
Middle artery:  carry blood to arterioles  distribution vessels Small artery and arteriole:  resistance vessels are regulated by neurohumoral factors Control of capillary blood flow
2. Capillary vessels: exchange vessels
Exchange of substances between
blood and interstitial fluid.
Precapillary sphincter.
Control of inflow of capillaries
A-V shunt (anastomosis)
Blood flow from arteriole to
venules by passing capillary.
3. Venous Vessels, capacitance
vessels: large vein, vena cava.
Blood reservoir
pliance, low mean
venous pressure, low
resistance vessels
Venous valve; venule.