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BIOC21H3 Study Guide - Adventitia, Nervi, Fibroblast


Department
Biological Sciences
Course Code
BIOC21H3
Professor
Stefan Rusyniak

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Lecture 7 Blood Vessels
TYPES OF BLOOD VESSELS
ARTERIES
VEINS
Blood Flow
Carries blood away from the heart.
Returns blood to the heart.
Blood Pressure
- Higher pressure.
- Needs more muscle and
elasticity to withstand pressure
and smooth out blood flow.
- Low pressure and often flows
against gravity.
- Needs valves to prevent
backflow, and a way to propel
blood.
Amount of Blood
in Vessel
- Contain the majority of blood
vessels.
- Storage of blood ~70% of
blood is in the venous system.
Layers
- Visible Internal and External
Elastic Membranes
(IEM/EEM).
- Thicker T. Media than T.
Adventitia
- 40-50 layers of SM in largest
artery (aorta)
- Thinner T. Intima.
- IEM is rarely visible, only in
large veins.
- T. Adventitia thickest layer in
veins
- 5-15 layers of SM in largest vein
(vena cava)
- T. Media thinner and contains
fibroblasts
Shape
- Round
- Small lumen
- Thick walls
- Collapsed, oval
- Flattened, oblong
- Large lumen
- Valves present (covered by
endothelium)
- Thin walls
Contents
- Lots of smooth muscle
- Dense Irregular CT
- Vasa vassorum present in T.
Adventitia
- Dense Irregular CT (e.g.,
fibroblasts, collagen, etc.)
- More elaborate vasa vassorum
- Nervi vascularis
TYPES OF ARTERIES
Aorta
Muscular Artery
(Medium Artery)
Small
Artery
Arteriole
Size
>1cm
10-100µm;
similar to RBC
size
Layers of SM
40-50
>10
8-10
1-3
Elastin Fibers
(EFs)
Thick, prominent
IEM/EEM and
clearly visible EFs
Not as many elastin
fibers
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