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Chapter 14

Chapter 14 - chapter notes.


Department
Biology
Course Code
BIO220H1
Professor
Matthews
Chapter
14

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Chapter 14: The Cardiovascular System: Blood Vessels, Blood
Flow, and Blood Pressure
Physical Laws Governing Blood Flow and Pressure
RULE : Flow = P/R
P = size of pressure gradient force that pushes the flow of liquid thru
pipe
R = resistance hinder the flow of liquid thru pipe
How pressure gradients and resistance affect blood flow in individual
vessels and network of vessels.
Pressure Gradients in the CVS
Pressure gradient drives the flow from region of higher pressure to
lower pressure, down the pressure gradient. Like a balloon. By Bulk
Flow.
The Role of Pressure Gradients in Driving Blood Flow
By pumping blood into the arteries heart raises arterial pressure
(Figure 14.1) rel.bet. pressure and flow in blood vessels.
Hydrostatic column vertical distance from the vessel to surface of
liq. That determines the pressure at either end of the vessel.
Hydrostatic column pressure. The deeper you go the more pressure
the h2o exerts on your body.
If difference between levels are constant as in Fig. 14c = Flow = 0 no
change.
Pressure Gradients Across the Systemic Circuit
In sys.circuit MAP Mean Arterial Pressure = 85mm
Hg
CVP - Central Venous Pressure pressure in the
large veins in the thoracic cavity that lead to the heart
= 2-8 mm Hg
Vena Cava = 0 mm Hg
The difference bet. The MAP and the CVP is the pressure gradient
that drives blood flow.
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