Bio3: Circulatory System

8/7/2019 Bio3: Circulatory System

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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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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)



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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



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Documents

Bio3: Circulatory System