The Veins and Process Flashcards
Veins have the same 3 wall layers are arteries. But what are the 3 classifications called
Postcapillary+muscular venules; Medium veins; Large Veins
Postcapillary venules are the smallest veins. What is a unique feature of them
They have a LOT of pores, allowing for fluid exchange
The tunica interna of the veins has a lot of pores allowing for fluid movement. What is something that commonly move through these pores
Leukocytes
Muscular venules are just like postcapillary venules but with muscle. Got it?
Got it
Medium veins are special because they form
Venous valves
Why do we need venous valves
So deoxygenated blood does not just go right back where it came from
Why do varicose veins happen
The valve weakens due to pooling of blood cause by obesity, inactivity, pregnancy, genetics
What is a varicose vein of the anus called
Hemmorrhoid
The blood from veins drain somewhere. What is the name of the places they drain
Venous sinuses
Venous sinuses can not constrict or dialate. This means they are not capable of
Vasomotor responses
Large veins are the biggest. They have ___ in them
Smooth muscle
Name the path of blood starting at the heart
Heart-Conductive arteries-muscular/distributing arteries- arterioles-capillaries-postcapillary venule- muscular venule-medium vein-large veins
Blood goes through many capillary networks before it returns to the heart T/F
FALSE
Typically, blood does NOT go through more than one capillary network. However, in what system does this occur?
The portal system
Where does the portal system occur
Kidneys, intestines to liver, hypothalamus and pituitary
Typically, blood goes from artery-capillary-vein. What is it called when the capillary step is skipped
Arteriovenous anastomosis (shunt)
When an artery flow right into a vein, such as arteriovenous anastomosis, what is it called
Anastomosis
One more time, what is the site called when two vessels connect with a capillary
Anastomosis
What the name for bypassing capillaries (not the site name)
Arteriovenous anastomosis (shunt)
Arteriovenous anastomosis
Venous anastomosis means that
One vein will dump into another just fine
Arterial anastomosis is when
Arteries merge
Why is arteries merging , or, arterial anastomosis, so important
It provides other routes for blood flow to a tissue
Where is arterial anastomosis, or convergence for arteries, common
Coronary circulation, joints
