Describe the differences seen in the hydra planarian clam gr

Describe the differences seen in the hydra, planarian, clam, grasshopper, and pig for symmetry, tissue organization, body cavity, digestive system, circulatory system, respiratory system, excretory system, support system and nervous system.

Solution

Hydra

Planarian:

Clam:

Symmetry

radial

bilateral

bilateral

Tissue Organization

diploblastic

triploblastic

triploblastic

Type of Body Cavity:

gastrovascular cavity

acoelomate

coelomate:

pericardial cavity

Digestive Openings

one

mouth

(pharynx extended during feeding)

mouth, a nu s

Circulatory System

none

none

heart, open c.s.

Respiratory Organs:

none

none

incurrent and excurrent siphon, gills

Excretory System

none

protonephridia, flame bulb

nephridia

Support System

: none

none

nephridia

Nervous System

Organization: nerve net

Organization: brain, ventral nerve cords

Hydra

Planarian:

Clam:

Symmetry

radial

bilateral

bilateral

Tissue Organization

diploblastic

triploblastic

triploblastic

Type of Body Cavity:

gastrovascular cavity

acoelomate

coelomate:

pericardial cavity

Digestive Openings

one

mouth

(pharynx extended during feeding)

mouth, a nu s

Circulatory System

none

none

heart, open c.s.

Respiratory Organs:

none

none

incurrent and excurrent siphon, gills

Excretory System

none

protonephridia, flame bulb

nephridia

Support System

: none

none

nephridia

Nervous System

Organization: nerve net

Organization: brain, ventral nerve cords

  • Nervous System Organization: three ganglia
 Describe the differences seen in the hydra, planarian, clam, grasshopper, and pig for symmetry, tissue organization, body cavity, digestive system, circulatory
 Describe the differences seen in the hydra, planarian, clam, grasshopper, and pig for symmetry, tissue organization, body cavity, digestive system, circulatory

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