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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

8Animal Protection and support

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.