Blood vessels Flashcards
What are the three layers in blood vessels?
Tunica intima (inner)
Tunica media
Tunica externa (outer)
What is the most innermost layer of BV?
What is it made of?
Function?
Anything else?
Tunica Intima- innermost
Endothelial cells create slick surface for smooth blood flow
Receives nutrients from blood in lumen
One cell thick
Large vessels may have subendothelial layer basement membrane- supports endothelial cells
What is the middle layer in blood vessels?
Made of?
Function?
Tunica Media- middle layer (M)
Made smooth muscle cells, elastin protein sheets
Receives nutrients from lumen
What is outermost layer of BV?
Made of?
Function?
Tunica Externa- outermost
Made woven fibres of collagen, elastic
Protects and reinforces blood vessel; helps anchor
What supplies blood to vessels?
Vaso vasorum
Which vessels have the most increase in pressure?
Arteriole
Is elastic tissues present in arteries or arterioles?
Arteries
Which vessel has the thinnest wall?
Capillary
Which vessel has the thinnest wall?
Capillary
Which vessels have fibrous muscle present?
Artery, venule, vein
What starling forces drive fluid out of vessels?
Capillary hydrostatic pressure
Osmotic force- due IF protein conc.
What starling forces drive fluid in to vessels?
IF hydrostatic pressure
Osmotic force- due plasma protein concentration
Label artery?
Label vein?
Function of:
Arteries
Capillaries
Veins
Arteries- carry blood away heart high pressure
Veins- return blood to heart low pressure
Capillaries- supply cell with requirements
- take away waste products
Structure wall of:
Arteries
Veins
Capillaries
Arteries- thick, strong
- muscles, elastic fibres, fibrous
tissue
Veins- thin
- main fibrous, little muscle and elastic
Capillaries- very thin
- one cell thick
What has more muscle and elastic- veins or arteries?
Arteries
Size of lumen of:
Arteries
Veins
Capillaries
Arteries- narrow
Veins- wide
Capillaries- v narrow- just RBC
What vessel has valves?
Veins- prevent backflow
Arteries and capillaries don’t
Function of arteries and how structure fits?
Strength/elasticity- withstand pulsing blood
- prevent bursting
- maintain pressure wave
- maintain high BP- no bf
Function veins and how structure fits?
No strong walls- most pressure lost
Wide lumen- less resistance to blood flow
Function capillaries and how structure fits?
No strong walls- most bp been lost
Thin walls/narrow lumen- blood close contact
body tissue
Allow diffusion
WBC pass between wall cells
What are 3 different artery types?
Elastic
Muscular
Arterioles
Elastic arteries?
Lot elastin in tunic media/externa
Allow arteries expand/recoil
Absorb pressure
Largest
Closest heart
