Transcript
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CIRCULATORYCIRCULATORY
SYSTEMSYSTEM
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3 principal functions of C.S.
Transportation nutrients and oxygen
Regulation transport of regulatoryhormones
Protection blood clotting and immune
defense
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For Cnidarians, Flatworms/ Planarians
which have two layers of body wall, havedirect contact with the external
environment that transport can occur by
diffusion.
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Types of Circulatory Systems
Open Circulatory System
exhibited by mollusks and arthropods
no distinction between the circulating fluid
(blood) and extracellular fluid (interstitialfluid/lymph): HEMOLYMPH
heart is a muscular tube which pumps
hemolymph through a network of channels
and cavities in the body
fluid drains back to the central cavity
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Closed Circulatory System
exhibited by annelids (invertebrates) and all
vertebrates
circulating fluid (blood) is enclosed in bloodvessels
Types of Circulatory Systems
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Closed Circulatory System
Earthworm
dorsal vessel contracts to function as pump
blood is pumped through 5 small connectingarteries which function as pumps to a ventral
vessel (transport posteriorly until it re-enters
dorsal vessel
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Fishes
have true chamber-pump heart
sinus venosus and atrium (collectionchambers)
ventricle and conus arteriosus(pumping
chambers)
Closed Circulatory System
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Amphibian and Reptile Circulation
Pulmonary Circulation
heart to lungs, then back to heart pulmonary artery-lungs-pulmonary vein-heart
Systemic Circulation
heart to body organs, then back to heart
Closed Circulatory System
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