BLOOD VESSELS

Precapillary Sphincters

Local Control of Blood Flow is achieved by Relaxation and Contraction of _______________

• SPHINCTER RELAXES = Blood Flow INCREASES

  • Oxygen and Nutrients = decrease

  • Carbon Dioxide = increases

  • pH = acidic

What happens during the VASODILATION of Precapillary Sphincter?

• Oxygen

• Carbon Dioxide

• pH

• Blood Flow

• SPHINCTER CONTRACTS = Blood Flow DECREASES

  • Oxygen and Nutrients = increases

  • Carbon Dioxide = decreases

  • pH = alkaline

What happens during the CONSTRICTION of Precapillary Sphincter?

• Oxygen

• Carbon Dioxide

• pH

• Blood Flow

Blood Vessel Constricts; Blood Pressure Increases

NERVOUS CONTROL:

• What happens blood vessel and blood pressure when vasomotor tone increases?

Outer Layer = Move Slowly
Center Layer = Move Rapidly

LAMINAR FLOW:

• Outer Layer = _________; Center Layer = ____________

• Blood Pressure — force of blood exerts against blood vessel

• Blood Flow —- amnt of blood moves through a vessel in a given period

Blood Pressure vs. Blood Flow

• Directly = Pressure Differences

• Inversely = Resistance

Blood Flow is:

• Directly Proportional to _____________

• Inversely Proportional to ____________

POUSEULLIES’ LAW

States that blood vessels’ diameter, length, viscosity decreases blood flow

LAPLACE LAW

States that Force that stretches the vascular wall is directly proportional to the diameter of the vessel times blood pressure (aneurysm)