CardioVascular: Arteries Flashcards
3 Principal Layers?
Intima (« intérieur »):
Seule couche qui est présente dans tout le système circulatoire
Média (« milieu »):
Couches de cellules musculaires lisses
Adventice (« addition »)
Tissu conjonctif de support
What makes up the intima layer?
Tapis de cellules endothéliales + Membrane basale
What are the roles of the intima layer?
Douanier dans les échanges entre le sang et le tissu
Thrombose et anti-coagulation
Recrutement des leucocytes (ex: infections)
What are Artères élastiques?
- Grosses artères centrales
(près du cœur) - Aorte
- Artères pulmonaires
- Artères carotidiennes
communes - Artères sous-claviculaires
Artères musculaires vs Artères élastiques?
Fibres élastiques concentrées dans 2 couches: interne
(IEL) et externe (EEL) -> artere musculaire
What is Vasa Vasorum?
The cells that line the light of the vessicle can get oxygen via diffusion, but the outside will need their own transport system:
Les vaisseaux du vaisseau
Not only in elastic arteries but everywhere in thick caliber vesicles
Which artery has the larger adventice?Artères musculaires vs Artères élastiques?
Artères musculaires
The adventice is much larger here → contains many nerves
Makes sense because if you want to stand up and do activity you want changes in vascular tone to be quick
True or False, Arterioles are small arteries that do not have smooth muscle .
FALSE
We still have smooth muscle
Lack of elastic fibers
Lack of adventice
What are capillaries?
Capillaries, the smallest and most numerous of the blood vessels, form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins).
The primary function of capillaries is the exchange of materials between the blood and tissue cells.
Properties of capillaries
No media (muscle lisse)
No adventice
Have Pericytes
Only Intima
What are the 3 types of capillaries?
Continue:
Fenestre:
Sinusoid/discontinue:
TRUE OR FALSE, because of the cotninous membrane in continous capillaries, larger cells are not capable of entering the membrane.
FALSE,,
YES, can pass through MF (marginal fold)
What kind of capilarry might you use when you need to filter substances from going across?
Fenestre, with diaphragme
When might you need a Sinusoid/discontinue capillaire?
For when we need continuous cell transport and migration (liver, spleen, bone marrow)
What are Metarterioles?
couche discontinue de muscle lisse that controls Microcirculation
Depending on physiological conditions for example when running you might need more exchange etc you can direct flow one way or another
