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Chapter 30 and extras
Mollusk Segmented worms Dissection info
Questions
Extras: Animal
characteristics Classification
of animal kingdom
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Basic Animal Characteristics
Embryo Development are similar Body plan : bilateral
radial
asymmetric Animals must digest food Animal Protection and support Dehydration problem
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Embryo Development
Stages of development
– sex cells fuse = zygote
– Blastula
– Gastrula
– ectoderm / mesoderm / endoderm
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Frog development Movie
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Chicken Development
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Body plan :
Bilateral = Can be divided down its length into similar right and left halves.
Radial = Can be divided along any plane through a central axis
Asymmetrical = Irregular in shape
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Animals must digest food Digestive systems.
– Food must be broken down after it is consume
• Why????
– Digestive tract
• one opening (Planaria)
• two openings ( worm )
• organs that make digestive enzymes
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The larger the animal the more support it needs
– Skeletal system give something for muscles to attach to.
– Help maintain body shape Two kinds of support Endoskeleton /
exoskeleton
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Terrestial Animals :Water Problem Living on land creates the problem of
dehydration. Special organs, structures and behaviors
are required:–Mucus– Thick skin or layers–Moist oxygen collectors (lungs)–Water recycling organs (intestine/rectum)– Special egg containers
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Important Technical terms
Dorsal Ventral Cephalic Cranial Anterior Posterior
Caudal Transverse longitudinal Proximal Distal Sagittal
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Classification of animals
Invertebrates
– Sponges
– Jellyfish
– Roundworm
– Mollusk
– Annelida
– Arthropods
Vertebrates
– Agnatha (hagfish)
– Sharks, Rays
– Bony Fish
– amphibians
– Aves (birds)
– Mammals
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Mollusks and Segmented worm
What is a mollusk? Where do Mollusks live? Classes of Mollusks What is a segmented worm?
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What is a Mollusk
Animals that are bilateral , have a coelom, two body openings, a muscular foot for movement and a mantle.
Soft bodies composed of a foot, a mantle a shell, and a visceral mass that holds all the major organs
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What Mollusk have in Common
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Origin of Mollusk
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Parts to Mollusk
Digestive system
Respiratory system
Circulatory system
Excretory system
Reproductive system
Nervous system
Muscular/ Skeletal systems
Protection
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Digestive System.
Mouth radula esophagus Stomach (1) Caecum (2) Intestine See Overhead for details
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Digestive system - 21933
Beak
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Respiratory system
Oyster Morphology
slide -21900
Squid Morphology
Slide -21910
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Circulatory system slide -
Open system ( blood bathe the organs )
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Brain - slide 21915/ 21941
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Reproductive system
Male sex organs Female sex organs Copulation Lay Eggs
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Excretory system
Diffusion in the visceral cavity anus / Intestine
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Protection
Coloration water siphon Behaviors ( schooling) Ink Sac
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Where do Mollusk live?
These animals are aquatic, marine and terrestrial.
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Classes of Mollusks
Classes are :
Gastropods - snails / slugs
Bivalvia- clams / oysters/ scallop
Cephalopoda- squid / octopus
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Gastropods -Snails (14456)
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Cephalopoda -Octopus
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Squids and Octopus
Octopus Squid 14447
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Cephalopoda- Large Octopus
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What is a segmented worm?
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Parts to Worm
Digestive system
Respiratory system
Circulatory system
Excretory system
Reproductive system
Nervous system
Muscular/ Skeletal systems
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Digestive system slide- 21888Protomium
mouth
pharynx
esophagus
crop
gizzard
Intestine
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Respiratory System
• Respiration = diffusion through
the wet skin
• This restrict the over all size of the animal.
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Circulatory System slide 21892 Aortic Arches
Closed system
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Excretory System - worm
Since this is a terrestial animal liquid waste is handled differently then solid waste.
Solid waste is removed by the anus
Liquid waste is removed by the NEPHREDIA
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Reproductive system
Worms are hermaphrodites Male pores
Female pores
copulation
seminal vesicles
clitellum
egg sac
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Nervous system
Ventral Ganglia Ventral nerve cord pharyngeal ganglion (paired) See Overhead
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Muscular system
Circular muscle layer= causes the sections to swell making the animal push forward
longitudinal muscle layers= pulls the other sections forward
Seta = provide traction in the soil
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Things to Know (100 words each)
1.How do each of the Dissected animals acquire food and how do they process it?
2.How is breathing accomplished for each?
3.How do terrestial animals adapt to living in a dry environment?
4.What special feature(s) makes each successful?
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Review material
What features allow these animals to become so large?
Why is it important to have better senses if you are larger?
How do land animals adjust to dry environments?
Why is it important for these animals to develop behaviors?
Explain how these animals are like us.