Lecture 5: Intro to Eumetazoa

Question 1

Metazoa

Answer 1

“Later,” group after Protozoa and Parazoa

multicellular, eukaryotic, heterotrophic organism lacking cell walls

have at least two tissue layers

synonymous with animals

Question 2

Eumetazoa

Answer 2

includes tissues, organs, digestive tract

have at least smooth logintudinal and circular muscles

Question 3

Radiata

Answer 3

• body with radial symmetry
• includes Cnidaria and Ctenophora

Question 4

Bilateria

Answer 4

• body with bilateral symmetry

Question 5

skeleton

Answer 5

a solid or fluid system permitting muscles to be stretched back to their original length following a contraction

may or may not have protective and supportive functions ( some support, some just provide location for muscle attachment)

not all skeletons look like human ones!

Question 6

hydrostatic skeleton

Answer 6

fluid cavity that evenly transmits pressure, fluid filled, has muscles supporting cavity(avoids it blowing up like a water balloon)

flexible outer membrane, can deform

volume of fluid constant, keeps it rigid but can change shape to adapt to environment (like a tire)

temporary attachments with substrate