Total perhipheral resistance Flashcards
What are the main reasons why we want high BP
1) So blood will flow high to flow, arterys to veins
2) So that we have control over divergant arteial blood flow
How is the systematic circulation designed to ensure blood flow to all parts of the body, and what deos this enable
parallel design which is a distributing system of branching arterys
enabling different organs to get different volumes of blood with divergant flow dependant on situation
How does blood flow vary during excersise
CO increases as excersise increases
doivergant flow increases to some and decreases to some organs
increases working factors, decreases non related organs
increase: heart (work)+ sm (work)+ skin(thermo)
decreases: GI + kidney
Note: brain remains constant virtually all the time
How is resistance related to flow rate
Increasing the flow rate requires a decreases in the resistance
Decreasing flow rate requires an increase in the flow rate
How does excersise change the resistance of organs divergant arterys
increased resistance: GI + Kidney
decreased resistance: SM + Heart + Skin
What is the determining factor for TPR
Arteriol smooth muscle changes radii which is proportional to resistance
R ∝ 1/r4, R *16 = r/2
regulating vascular tone
- increases resistance of less used organs
- decreases resistance of more used organs
