circulatory system-vert

tunica intima

only present in capillaries, centermost layer including endothelial lining

tunica media in arteries

middle layer

-some smooth mucles, mostly elastic fibers

tunica media in veins

middle layer

-smooth muscles with almost no elastic fibers

tunica adventitia

superficial most layer comprised mostly of fibrous connective tissue

smooth muscle controls

capillary bed blood flow

most fish have a ____ pass circulatory system

single -meaning blood only passes trough once during each circuit

most humans and amniotes have a ____ pass circulation

double- meaning blood passes through the heart twice during each circuit

lungfish, amphibians, and reptiles have ____ pass circulation

incomplete/ intermediate double circulation

blood islands

clusters of mesodermal cells that give rise to blood vessels and blood cells

embryonic heart

sinus venosus, atrium, ventricle, and bulbus cordis

subclavian arteries carry blood

to anterior appendages

iliac arteries carry blood

to posterior appendages

celic artery supplies

liver, spleen, stomach, part of intestines

anterior mesenteric artery supplies

small intestines

posterior mesenteric artery supplies

large intestines

hepatic portal vein

digestive tract to liver

ostrecaderms branchial arches

10

lamprey branchial arches

8

hagfish have ___ aortic arches

15

sharks have ___ aortic arches

10-12

afferent artery

delivers blood to the gills

efferent arte