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DEV LUNG (Valves (Foramen Ovale (Opening connecting right and left atrium,…
DEV LUNG
Valves
Ductus venosus
Foetal blood vessel
Connecting umbilical vein to :
Vena cafa
Fetal liver
Regulated by sphincter
Ductus Arteriosus
Foetal blood vessel
Connecting pulmonary trunk to descending aorta
Foramen Ovale
Opening connecting right and left atrium
Protects lungs
Arteries
Take blood away from the heart
Designed to withstand high pressure
Veins
Take blood to heart
Low pressure
Capillaries
Perform gaseous exchange
Reduced pressure and speed
Due to sheer volume
Gaseous exchange via skin
Con's:
Water loss
Arterioles
Venules