PNB 2265 Exam 2 ACTUAL UPDATED QUESTIONS AND CORRECT ANSWERS
Blood Flow Way in the blood moves from vessel to vessel
Which way does blood flow? From high pressure to low pressuer
How can we get blood to flow with ease? Establish a constant decrease in pressure at each step
, Resistance Opposition of blood flow caused by the friction between blood components
coming into contact with vessel walls
How can we change resistance and blood flow Changing hematocrit or by changing the radius of the blood vessel
How do we change hematocrit We have to make/release a hormones, have it travel to the bone marrow, find a
certain stem cell, tell it to differentiate, have it differentiate, and move it into the
circulate
How do we change the radius? By having the smooth muscle layer of the vessels contract and narrow or relax
and widen
Equation showing the relationship between resistance R = 1/(r)^4
and radius Where R = Resistance and r = radius
Relationship between resistance and radius Resistance and radius are inversely proportional to each other but a small change
in radius results in a big change in resistance due to the exponential factor
aneruysm When the blood vessels swell due to not being able to withstand the pressure;
occurs in large vessels; since large vessels have large amounts of blood if it
bursts there would be a lot of blood loss
Differences between arterial and venous anatomy Arteries have a thicker tunica media and much more developed smooth muslce,
Veins have a system of valves to prevent backflow of blood, veins are more
superficial, and veins have a larger lumen/radius due to tunica media loss
Comparisons between arterial and venous vessel Both have the same three layers, contain smooth muscle, and are both innervates
anatomy by the sympathetic nervous system
How can veins generate pressure 1) Create high pressure in the spot they want to send blood out of
2) Create very low pressure in the place they want to send blood to
How do arteries generate their own pressure By recoiling due to low compliance
Blood Flow Way in the blood moves from vessel to vessel
Which way does blood flow? From high pressure to low pressuer
How can we get blood to flow with ease? Establish a constant decrease in pressure at each step
, Resistance Opposition of blood flow caused by the friction between blood components
coming into contact with vessel walls
How can we change resistance and blood flow Changing hematocrit or by changing the radius of the blood vessel
How do we change hematocrit We have to make/release a hormones, have it travel to the bone marrow, find a
certain stem cell, tell it to differentiate, have it differentiate, and move it into the
circulate
How do we change the radius? By having the smooth muscle layer of the vessels contract and narrow or relax
and widen
Equation showing the relationship between resistance R = 1/(r)^4
and radius Where R = Resistance and r = radius
Relationship between resistance and radius Resistance and radius are inversely proportional to each other but a small change
in radius results in a big change in resistance due to the exponential factor
aneruysm When the blood vessels swell due to not being able to withstand the pressure;
occurs in large vessels; since large vessels have large amounts of blood if it
bursts there would be a lot of blood loss
Differences between arterial and venous anatomy Arteries have a thicker tunica media and much more developed smooth muslce,
Veins have a system of valves to prevent backflow of blood, veins are more
superficial, and veins have a larger lumen/radius due to tunica media loss
Comparisons between arterial and venous vessel Both have the same three layers, contain smooth muscle, and are both innervates
anatomy by the sympathetic nervous system
How can veins generate pressure 1) Create high pressure in the spot they want to send blood out of
2) Create very low pressure in the place they want to send blood to
How do arteries generate their own pressure By recoiling due to low compliance
