Zusammenfassung der Ressource
Histology of Heart and Blood Vessels
- Vessels
- Tunica adventitia
- connective tissue
- In
contact
with ECF
- Gives support
Anmerkungen:
- important to maintain shape
- Tunica media
- smooth muscle
- allows tone
Anmerkungen:
- gives elasticity and contractility
- regulates
blood
pressure
- thicker in arteries
Anmerkungen:
- thickest in aorta and pulmonary arteries - lots of elastic lamellae to stretch and recoil in response to pulse
- elastic lamellae
Anmerkungen:
- look dark under a microscope
- Dissecting aneurism of aorta
Anmerkungen:
- blood enters t. media due to wall rupture
- Tunica intima
- endothelium
- collagen
- in contact with blood
- selectively
permeable
- makes
mediators of
inflammation
and tone
- Regulates
adhesion of
platelets
- Muscular artieries
Anmerkungen:
- e.g. carotid, iliac,brachial
- distribute blood
- not elastic
- contractile
- regulate flow
- regulate pressure
- Lots of collagen in adventita
- layer of elastic lamina
between media/intima
and media/adventitia
- Arterioles
- microscopic
- regulate flow
- regulate pressure
- Capillaries
- mainly
endothelial
cells
- exchange
- Continuous
- NO gaps in walls
- Fenestrated
- pores
- Sinusoids
Anmerkungen:
- WIDE fenestrations
- Veins/venules
- thin/flexible walls
- more prominent
adventitia
- thin/no t.media
- valves
- longitudinal smooth
muscle between valves
Anmerkungen:
- assists flow against gravity
- Heart
- pumps blood
- regulates BP
- secretes ANP
Anmerkungen:
- atrial natriuretic peptide
- stimulated by over stretched atria
- Increases water and
sodium uptake to urine
Anmerkungen:
- valves
- elastic fibres
- collagen
- Epicardium
Anmerkungen:
- fatty, loose connective tissue
- nerves
- vessels
- coronary arteries
- mesothelium
- simple cuboidal
- adipose tissue
- Myocardium
- part which contracts
- Endocardium
- endothelium
- loose connective tissue
- lots of Purkinje fibres