Characteristics of animals Flashcards

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1
Q

What are the characteristics of animals?

A
  • Heterotrophic,multicellular eukaryotes
  • No cell walls
  • Oxygen for aerobic respiration
  • Almost all animals have specialized nervous tissue
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2
Q

What are classification schemes used?

A
  • Number of germ layers
  • Type of body symmerty (Asymmetrical, radial symmetry, bilateral)
  • Presence/absence of a coelom
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3
Q

What do the germ layers do?

A

Give rise to specific tissues and organs

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4
Q

What are the 3 different types of germ layers?

A
  1. Endoderm
  2. Ectoderm
  3. Mesoderm
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5
Q

What does the endoderm do?

A

Its the digestive and respiratory layer

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6
Q

What does the ectoderm do?

A

Its the outer covering and nervous system

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7
Q

What does the mesoderm do?

A

Its the circulatory, muscles, and skeletal systems

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8
Q

What are the germ layers in diploblastic acelomates?

A

Has only gut, endoderm and ectoderm

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9
Q

What are the germ layers in triploblastic acoelomates?

A

Has only a gut, endoderm, mesoderm, ectoderm

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10
Q

Whats the symmetry of diploblasts?

A

Radial symmerty

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11
Q

Whats the symmetry of triploblasts?

A

Bilateral

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12
Q

What is cephilization?

A
  • Concentration of sensory organs at the anterior (front end)
  • Found in bilateral organisms
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13
Q

What is a coelom?

A

Mesoderm may develop into a fluid filled internal body cavity.

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14
Q

Whats in a coelom?

A

Contains: gut, organs, and epidermis

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15
Q

What are the characteristics of Coelom acoelomates?

A

-Mesoderm filled with tissue
- Still have a gut

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16
Q

Whats an example of coelom acoelomates?

A

Flatworms

17
Q

What are the characteristics of Pseudocoelomates?

A
  • False coelom (but still functional)
  • Coelom lined by mesoderm and endoderm
18
Q

Whats an example of a pseudocoelomate?

A

Round worms

19
Q

What are the characteristics of Coelomates?

A
  • True coelom
  • Gut and body wall both lined with mesoderm
20
Q

What are examples of Coelomates?

A

Annelids, mollusks, arthropod chordates.