SFOS 22

How is total vascular resistance changed

Vasocontriction modulation from sympathetic NS
Types of local control of blood flow
- Basal tone - nerve independent vessel tone
- Blood flow autoregulation - constant flow despite perfusion pressure
- Active/Functional Hyperemia
- Reactive Hyperemia
What are the theories of autoregulation?

Myogenic - autoregulation is intrinsic to vessel (stretched vessels contract to compensate)

Metabolic - Vasodilator metabolites are produced by the tissue
Active/Functional hyperemia

Higher blood flow seen when functional activity increased
Reactive hyperemia

Blood flow increased after period of restricted blood flow
Vasodilator metabolites
- Adenosine
- Hypoxia
- CO2
Vasodilator hormones
- Bradykinin
- Histamine
Vasocontrictor hormones
- Norepinephrine, epinephrine
- Angiotension II
- Vasopressin

Author

zf2010

80243

Card Set

SFOS 22

Description

SFOS 22

Updated

2011-04-18T00:19:33Z