Flashcards in PSL301: Cardio 5 Deck (38):
Describe pulmonary circulation
pulmonary trunk -> 2 pulmonary arteries -> lungs -> 4 pulmonary veins -> left atrium
Aorta branches to...
3 subclasses of arteries
1. Elastic artery
2. Muscular artery
Branched from aorta
Elastic fibres in vessels to deal with high pressure
Distribute blood to various parts of the body
3 layers of the blood vessel
1. Tunica externa
2. Tunica media
3. Tunica intima
- Collagen; fibrous connective tissue
- Holds vessel together
- Smooth muscle
- Elastic tissue
- Creates / stores pressures
- Regulate vasodiltion / constriction (SNS)
- Endothelial cell layer
- Supported by loose connective tissue
Difference between arteries & veins
- Small lumen
- Thick tunica media
- Have elastic tissue (outside tunica media muscles)
- Wide lumen
- No elastic tissue
degree of constriction experienced by a blood vessel relative to its maximally dilated state
Arteries have ___ vascular tone, veins have __.
Pressure in left ventricle ranges from...
Pressure in aorta ranges from...
Lowest pressure in arterioles
Capillaries cause pressure to fall from __ to __
40 -> 20
Venules & veins cause pressure to fall from __ to __
20 -> 0
Arteries have the most (what component), but it has a little bit of everything.
(everything = endothelium, elastic tissue, fibrous tissue)
Every blood vessel has (what component)...?
Arterioles have the most (what component)...?
Capillaries have the most (what component)...?
endothelium (only thing it has)
Venules have the most (what component)...?
Veins have the most (what component)...?
About the same elastic tissue / smooth muscle / fibrous tissue
Components that make up blood vessels
2. elastic tissue
3. smooth muscle
4. fibrous tissue
__% of the body's blood is on the venous side
___ regulates flow into capillary beds
Why must another vessel regulate flow in capillaries?
Capillaries only have an endothelial layer, so it cannot regulate vasodilation / constriction
How do metarterioles regulate blood flow in capillaries?
with precapillary sphincters
What happens when precapillary sphincters are shut?
Blood goes straight from arterioles -> venules through arteriovenous shunt
What cell always uses the arteriovenous shunt?
WBC (too big to go through capillaries)
Example when blood flow through capillaries is bypassed?
When you exercise, blood to gut capillaries is stopped
How much water is in intracellular components?
27L - 30L
How much water is in extracellular components
14 - 16.5L
Fluid can be lost through...
Blood pressure is __ at arteriole end, __ at venous end
Osmotic pressure is...
At the arteriole end, __ happens because of net pressure outwards
Hydrostatic pressure > osmotic pressure