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Honors Biology
Module 12 Arthropods
February 11, 2016
Class Challenge
Next Week’s Class Challenge
Valentine’s Day: Pay it forward
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Give Valentine cards anonymously
Volunteer at a local charity
Visit the elderly
Hug or call a family member
Thank a teacher or student
Shovel snow for a neighbor
Leave treats in the yard for rabbits, squirrels and birds
Donate soda tabs or cans to a local organization
Make nutritional treats for dogs and cats of neighbors,
friends or animal shelter
• Volunteer to baby sit (for free)
• Donate blood
My Mistake on the Homework
Assignment
Begin Reading Module 12
Finish OYO for Module 11
Finish Study Guide for Module 11
Take Module 11 Test
Missing Assignments
Please see me at the end of class.
Earthworm: Internal Anatomy
Quiz
• Earthworm Diagram
External Anatomy of Earthworm
A.
B.
C.
D.
E.
Anus
Segment
Setae
Clitellum
Mouth
Total 5 points
Internal Anatomy of Earthworm
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Pharynx
Aortic Arches
Seminal Vesicle
Crop
Dorsal blood vessel
Intestine
Gizzard
Ventral blood vessel
Seminal receptacles
Mouth
10 points
Total 15 points
Phylum Arthropoda
Not having a backbone isn't as bad as it
seems for some creatures.
In fact, more than 95% of the world's animal
population is spineless! They crawl on the
ground, fly in the air and skim across the
water.
They also have an amazing effect
on the environment
1. Help plants reproduce by carrying pollen from
one plant to another.
2. They produce useful items such as silk, wax,
honey, and drugs.
Some anthropods are very necessary for the
earth’s ecosystem, they can also be very
dangerous.
1. Transmit deadly diseases.
2. They can destroy millions of acres of crops.
Phylum Arthropoda
1.
2.
3.
4.
5.
Crayfish
Lobsters
Spiders
Scorpions
Insects
Arthropods have 5 Common
Characteristics
1. All Arthropods have an
Exoskelton
Which is a body covering that typically is
made of chitin, that provides support and
protection.
As the animal grows, it must molt or shed
an old outer covering so that it can be
replaced with a new one.
2. Body Segmentation
The body is divided into three major divisions:
1. Head
2. Thorax- region between the head and
abdomen.
3. Abdomen- region posterior to the thorax
Some arthropods have the thorax and head
united in a single segment called a
cephalothorax
This segmentation is necessary in order to
allow the exoskeleton to shift with the
movements of the body.
Think of it like “joints” in the “armor”
3. Jointed Appendages
Arthropoda means “joint-footed”. Their
appendages are jointed. Their muscles
form under the exoskelton, moving the
joints from underneath.
4. A Ventral Nervous System
Two ganglia form a brain (remember the
earthworm), but it is more complex. The
ventral nerve cord runs from the ganglia
along the underside of the body to provide
maximum protection from the exoskeleton
and the bulk to the body.
Arthropods do everything they can to protect
the underside of their body protecting the
ventral nerve cord.
The Nervous System
Is fed information through sensory organs.
Antennae in the head region provide touch,
taste, and smell sensations to the nervous
system.
All Arthropods have Eyes
Compound eye: an eye made of many
lenses, each with a very limited scope
Simple eye: an eye with only one lens
See figure 12.1
5. An Open Circulatory System
Arthropods have quite an unusual circulatory
system. In order to bring vital substances
to every cell in the body, a heart in the
dorsal (upper) region pumps blood into
short vessels that empty out into different
cavities of the body.
This allows blood to flow right over all of the
cells in that cavity.
All Arthropods have
Bilateral Symmetry
Dissection of a Crayfish
Crayfish Anatomy Part 1
http://youtu.be/2cBGuEDxvNo
Crayfish Anatomy Part 2
http://youtu.be/wSGEt1mY2OM
Shrimp Dissection
Internal Anatomy of a Shrimp
Crab Dissection
Homework
Read Module 12 pages 365 – 376;
OYO questions: 12.1 – 12.5;
Study Guide questions: define a-h, 2-11;
Complete Lab book: Experiment 12.A Shrimp
Dissection: Draw and Label external and internal
anatomy;
Quiz: External and Internal Anatomy of a shrimp;
Class Challenge: Valentine’s Day: Pay it forward