Ch. 42 Circulation and gas Exchange
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Transcript Ch. 42 Circulation and gas Exchange
Ch. 42
Circulation and
gas Exchange
Open Circulatory System
Insects (other arthropods) and molluscs
No distinction between blood and
interstitial fluid.
Hemolymph – body fluid
Body movements squeeze sinuses which
moves hemolymph
Closed Circulatory System
Earthworms, squids, all
vertebrates
Blood in vessels separate from
interstitial fluid
Heart pumps blood into vessels.
Blood Vessels
Arteries – Blood Away from the heart
Veins – Blood to the heart
Capillaries – tiny vessels. Blood supply
can vary depending on the site of
capillaries.
Ex. Digestive system capillaries
will fill with blood after a meal.
Components of Blood
Plasma, RBC (transport O2), WBC
(immune) and platelets.
Blood Clots caused by fibrin
protein.
Self sealing material after a cut or
scrape.