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BIO271H1 Study Guide - Countercurrent Exchange, Hemolymph, Cephalochordate


Department
Biology
Course Code
BIO271H1
Professor
Kenneth Yip

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Respiratory
Circulatory
Sponges
-Lack circulatory system
-Circulate external medium through
cavity
-Flagella move water in through ostia and
out through the osculum
Flatworms
(Platyhelminthes)
-Lack circulatory system
Cnidarians
-Lack circulatory system
-Circulate external medium through
cavity
-Muscle contractions move water in and
out
Annelids
-Open and Closed circulatory
system
Nematode (roundworms)
-Lack circulatory system
Echinodermata
-Lack circulatory system
Cephalochordate
-Open circulatory system
Molluscs
-Open circulatory systems
-Have hearts and some blood
vessels
-Ventilate gills with cilia or muscle
contractions
-countercurrent flow
Cephalopods
-Closed circulatory system
-Ventilate gills with muscle contractions
-countercurrent flow
Crustaceans
-Rely on diffusion
Arthropods
-At least on heart and some blood
vessels (open system)
-Heart pumps hemolymph
-Hemolymph returns via ostia
-Neurogenic heart
Insects
-Tracheal systems
-Air filled tubes called tracheae
-Ends of tracheoles are filled with
hemolymph
-Tidal or unidirectional
-Ram ventilation
Vertebrates
-Close circulatory system
Hagfish
-Muscular pump propels water through
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