Monday, February 27, 2012

Scribe Post 2/27/12


Today in Class...
-Turned in the isopod lab
-Starfish dissecting lab- UP 63-66
-Watched a video about invertebrates
Starfish Lab
Starfish are a part of the Echinodermata Phylum
-echin means prickly
-derma means skin
Starfish feel prickly and squishy
Parts of Starfish- what we looked for
Dorsal View
Central disc- center of starfish
Rays- "arms" usually five
Madreoporic plate- small yellow or red structure on central disc
Spines- hard, covers everything, part of exoskeleton
Aye spot- tip of each arm
Anus- opening in center of central disk
Ventral View
Mouth- center of central disk, surrounded with spines
Ambulacral groove- groove along center of rays
Tube feet- at tips of ambulacral groove, help with movement
After snipping of the tip of one ray, there is a gland called the pyloric cecum - part of digestive system
There are 5 in a starfish
Starfish have separate sexes,
testes are gray, ovaries are orange- but it is hard to tell in preserved starfish
There are 5 paris of gonads in a starfish
They have 2 stomachs
The mouth is on the ventral side- above stomach
The anus is on the dorsal side-under stomach
Water vascular system- Madreoporic plate and anything connected to it
Tube feet- suction cups, help starfish move and hold prey
Ampullae- connected to a tube foot, pink and bulblike
5 Radial Canals- inside ambbulacral groove, long hollow tube that is connected to all other radial canals through ring canal
1 circular canal
Human Ciculatory system is like the Starfish's Vascular sytem because they both have "canals"(blood vessels) that transport things
Video:
Invertebrates can live without vertebrates, but vertebrates can't live without invertebrates.
Most animals are invertebrates.
Not the same video but its a good review about invertebrates:
Homework:
Finish UP 63-66
Up 75-76
Nature due this Friday
Next Scribe:
Brianna

3 comments:

  1. The labeled picture of the starfish and the video were both nice touches!! Helped get the point of the experiment across.

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  2. Thank you Melissa for this nice post. The phito was very helpful and important information was given. Thanks, good job!

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  3. Great job Melissa! Your post helped really look over my lab and correct some of my answers. The starfish diagram really helped.

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