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22 Cards in this Set

  • Front
  • Back
At _ total cross sectional area of vascular system is maximized so there is slow linear flow
Capillaries
Which side of circulation has lower cross sectional area (and volume) and higher linear flow
Arterial
Also called resistance vessels
Arterioles
Have high elastic modulus and low compliance
Arteries and arterioles
Low compliance, high pressure, low volume
Arteries
Have large diameter and offer little resistance to flow
Arteries
Short small diameter vessels with lowest compliance of any vascular elements and consist mainly of smooth muscle
Arterioles
Serve as main regulators of flow from arteries to capillary beds and are the site of highest resistance in CV system
Arterioles
Arterioles are sensitive to : (3 factors)
ANS

Hormones

Local tissue factors
Single smooth muscle cell which acts as a sphincter and can locally occlude a capillary bed
Pre capillary sphincter
Only vessels across which exchange of most nutrients and waste products can occur
Capillaries
Largest total cross sectional area of any of vascular elements
Capillaries
Is velocity of flow in capillaries high or low
Low - allowing appropriate time for exchange to occur
Clinical problems associated with capillaries
Increased permeability due to toxins or burns leading to edema

Occlusions associated with sickle cell - clogging capillaries, causing ischemic/hypoxic conditions at tissue level - painful
Capacitance vessels - high compliance
Veins and venules
Sudden loss of venous tone results in _
SYNCOPE - venous side loses all tone and blood pools in these vascular elements (due to extremely high compliance) and is not forced into the arterial circulation
Clinical problems affecting the veins
Inflammation which can lead to emboli

Varicosities caused by inadequate flow and incontinence of venous valves
Name vessel

Low pressure
Very high compliance
High volume
Low resistance
Veins
Name vessel

High pressure
Low compliance
Low volume
Low resistance
Arteries
Low pressure
High compliance
Low volume
Variable resistance
Venules
Low pressure
High compliance
Low volume
Low resistance due to high cross sectional area
Capillaries
High to Medium Pressure
Variable compliance
Low volume
High (variable) resistance
Arterioles