lecture 6 Flashcards
3 layers of blood vessel wall?
Tunica intima
tunica media
tunica adventitia/externa
Layers of the tunica intima?
Endothelium - simple squamous epithelium
Sub endothelium - loose FCT
Internal elastic lamina - sheet of elastic tissue,
Is the internal elastic lamina more developed in veins or arteries?
arteries
Tunica media is what kind of muscle?
Smooth muscle
Tunica media consists of
Connective tissue fibres, mainly elastin and collagen
A blood vessel with high blood pressure will have a thick or thin tunica media?
Thick tunica media
Tunica externa has a high amount of what tissue?
Connective tissue with high amount of collagen and variable amount
The tunica adventitia contains what in larger vessels?
Vasa vasorum
Vasa vasorum does what?
Is the large vessels own blood supply
lymphatics and autonomic nerves are found in what layer of the blood vessel?
Tunica adventitia/externa
Function of an arteriole?
Determine the blood pressure by acting as resistance vessels
Function of capillaries?
site of exchange between blood and tissues
Veins function?
Low pressure, large volume transport system
what is a capacitance vessel?
When veins can store a limited amount of blood and act as a reservoir. they have spare capacity
Shape of veins?
irregular, flattened shape with large lumen and thin wall
Why do veins have a large lumen?
To carry blood at a low pressure
Three layers of veins?
Intima
media
adventitia
What is the thickest layer of the veins?
Usually it is the adventitia
What has a thicker tunica media, veins or arteries?
Arteries, veins usually only have two distinct layers of smooth muscle.
Function of venules?
drain the capillary bed
Makeup of venules?
layer of endothelium with small amounts of smooth muscle and collagen
Which layer of the veins has valves that prevent back flow?
Intima
Where does oxygenated blood leave from?
the left ventricle
Blood supply from heart to foot?
left ventricle, travels to the aortic arch -> descending aorta -> abdominal aorta -> Common iliac aorta -> common iliac artery -> external iliac artery -> femoral artery -> popliteal artery -> posterior tibial artery -> plantar arch
Venous drainage from foot to heart?
deoxygenated blood will travel up from the plantar venous arch -> posterior tibial veil + great saphenous vein -> popliteal vein -> into the femoral vein -> external iliac vein -> common iliac vein -> Inferior Vena Cava -> right atrium