Module 12 Flashcards
(43 cards)
Exoskeleton:
A body covering, typically made of chitin, that provides support and protection.
Molt:
To shed an old outer covering so that it can be replaced with a new one.
Thorax:
The body region between the head and the abdomen.
Abdomen:
The body region posterior to the thorax
Cephalothorax:
A body region composed of the head and thorax fused together.`
Compound eye:
An eye made of many lenses, each with a very limited scope.
Simple eye:
An eye with only one lens
Open circulatory System:
a circulatory system that allows the blood to flow out of the blood vessels and into various body cavities so that the cells are in direct contact with the blood
Statocyst:
The organ of balance in a crustacean
Gonad:
A general term for the organ that produces gametes
Complete metamorphosis:
Insect development consisting of 4 stages egg, larva, pupa, and adult.
Incomplete metamorphosis:
Insect development consisting of 3 stages egg, nymph, and adult.
Name the 5 common characteristics among the arthropods.
1) Exoskeleton 2) body segmentation 3) jointed appendages 4) open circulatory system 5) a ventral nervous system
Name the structures of the outside of a crayfish:
a. Antennae b. Antennules c. cephalothorax d. abdomen e. telson f. uropods g. swimmerets h. carapace I. walking legs j. chelipeds
What is the black structure at the front of a crayfish and what does it do?
it is the eye It detects light
What is the large mass behind the black structure on the inside of a crayfish and what does it do?
it is the brain ganglia they constantly send nerve impulses (information) down the nerve cord regarding light (from the eyes), taste and touch (from the antenna and antennules and tiny bristles).
what is the large circular mass in the middle near the front (inside the crayfish) and what does it do?
it is the stomach it grinds the food and then sorts the particles.
What is the large formless mass in the upper half (inside the crayfish) and what does it do?
it is the gonad it is where the gametes are stored.
What is the smaller oval mass with tubes coming out of it near the top (inside the crayfish) and what does it do?
it is the heart. It pumps the blood through the blood vessels
What is the larger oval mass surrounding the smaller oval mass (inside the crayfish) called and what does it do?
It is the pericardial sinus it collects the blood until it can enter the heart.
What is the large tube in the middle (inside the crayfish) called and what does it do?
It is the intestine. It digests what it can by the use of digestive enzymes
What is structure at the very end of the long tube in the middle of the crayfish (inside the crayfish) called and what does it do?
It is the anus. It is where waste is expelled
What is the long tube with bumps on the bottom half (inside the crayfish) called and what does it do?
it is the nerve cord. It delivers the information from the brain ganglia to the rest of the body
What is the large formless mass in the lower half of the body (inside the crayfish) called and what does it do?
It is the digestive glands. They are where the food goes before the intestine and secrete enzymes into the food.
