Bio Chp 27 Warm up 5
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What were the first animals with jointed appendages?
What were the arthropods the first animals with?
Are arthropod bodies segmented?
When do individual segments of arthropods often exist?
Only during their larval stages
What often exist only during arthropods larval stages?
Inividual segments of arthropods
What is a larva?
An immature organism that has a body form different from that of the adult
In what form are the segments in adult arthropods?
What are the 3 functional body parts of an adult butterfly?
Each unit is composed of what?
Several fused segments
What are characteristics of all adult insects?
Head, thorax and abdomen
What are the joinded appendages all arthropods have? Functions?
- Legs; walking
- Wings; flying
- Antennae; to sense their environment
- Mouthparts; sucking, ripping and chewing their food
What would happen to a person if they did not have jointed appendages?
Could not walk or grasp any object
What type of skeleton do arthropods have and what is it made of?
An exoskelton made of chitin
Where do the muscles attach to the exoskeleton?
The interior surfaces
What two major things does an exoskeleton do for an arthropod?
Protects it from predators and prevents water loss
What is the arthropod exoskeleton's limitation?
It cannot support great weight
What is segmentation?
The building of a body from a series of similar segments amoung the coelomates
What were the first segmented animals?
What were the annelid worms the first animals with?
Annelids like the _____________ are composed of what?
polychaetes, A chain of nearly identical segments
What is the advantage of segmentation?
The flexibility it offers with segments with a different function
What are some segments modified for?
- Eliminating Wastes
Where do 2/3 of annelids live? What are most others?
In the sea, earth-worms
How many annelids live in the sea?
What is the basic body plan of an annelid described as?
"a tube within a tube"
What is the gut like in an annelid?
A tube suspended within the coelom
What is the coelem in the annelids?
A tube from mouth to anus
What three characteristics do all annelids share?
- Repeated segments
- Specialized segments
- Connections between segments
Except in leeches, the body segments of an annelid are divided how?
From one another internally by partitions
What does each segment have?
A digestive excretory and locomotor (movement) organs
What creates a hydrostatic skeleton for rigidity?
The fluid within the coelom of each segment
What does the fluid within the coelem of each segment create?
A hydrostatic skeleton for rigidity
What are the advantages of each segment being separate?
Each segment is able to expand or contract independently so an earthworm can lengthen some parts of its body while shortening others
The _________ segments of annelids are __________ and contain what?
anterior, modified, the sensory organs that are sensitive to light; some annelids have elaborate eyes with lenses and retinas. All have well-developed cerebral ganglion, or a brain.
What does the circulatory system do and what does the nerve cord do?
- Carries blood from one segment to another
- Connects nerve centers (ganglia), with the brain to coordinate the worm's activities
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