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BIOL 113 (Animal Biology) > Ceolom > Flashcards

Ceolom Flashcards

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1
Q

Absence of body cavity is a feature of

A

Aceolomates

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2
Q

False body cavity is Xtics of

A

Pseudoceolomate

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3
Q

True body cavity

A

Ceolomate/ Euceolomate

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4
Q

Vertebrates % in kingdom animalia

A

3%

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5
Q

Invertebrates % in kingdom animalia

A

97%

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6
Q

Ceolom is

A

Fluid filled cavity between internal organs and body wall

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7
Q

Which Phyla are aceolomates?

A

Cnidaria

Platyhelminthes

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8
Q

What is the solid body of aceolomates made of?

A

Mesogloea

Mesenchyme/ parenchyma

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9
Q

What is the primary body cavity in pseudocoel called?

A

Blastocoel- reduced on gut formation

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10
Q

Blastocoel

A

Primary body cavity in embryonic development

Reduced on gut formation but leaves space between endo and ectoderm

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11
Q

How is the solid body of aceolomates formed?

A

In the blastocoel after the pseudoceol is reduced

formed as a result of failure of parenchyma to completely fill space between mesoderm and and gut wall

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12
Q

Xtics of pseudoceolomates

A

No peritoneal layer ( present in ceolom)

  • Gut wall has no muscle layers
  • organs partly bathed in PERIVISCERAL FLUID and free within the cavity
  • Pseudocoel formed as a result of failure of parenchyma to completely fill space between mesoderm and and gut wall
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13
Q

Which phylum is a pseudoceolomate?

A

Nematoda

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14
Q

What separates the fluid from the gut and body wall in ceulomic cavity?

A

Peritoneal epithelium— Peritoneum

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15
Q

How does ceolom form in ceolomates

A

Bu splitting of mesoderm due to fluid accumulation during development

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16
Q

Schizocoel

A

Perivisceral ceolom that forms as a result of the splitting of mesoderm

17
Q

Ceolom formed from out pockets of the mesoderm is

A

Enteroceol

18
Q

Cephalization

A

Development of all features associated with head.

19
Q

What are the two groups of ceolomates based on comparative embryology?

A

Protostome— spiral cleavage of egg after fertilization

Deutrostome— Radial cleavage of fertilized egg

BIOL 113 (Animal Biology) (6 decks)

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