Arthropod Lab March 14, 2014- Zhengde Du
Grasshopper and my hand
You can see that the grasshopper has an exoskeleton, and three pairs of legs.
You can see the crayfish has antennae and the swimerettes are just barely visible.
A nice diagram with the exoskeleton of the crayfish labeled.
The Respiratory System
The respiratory system starts with the gills, which are located on the outside of the body between the crayfish body wall and carapace. The gills take in oxygen in from the water as the crayfish walks. The oxygen is exchanged into the blood across the gill surface by circling around the branchial chamber. The circulatory system then sends the oxygen away to the body.
The respiratory system starts at the ten spiracles located in the abdominal region. Oxygen diffused into the cells through the tracheae. The air sacs, similar as the alveoli, works as a temporary storage for the two gases, oxygen and carbon dioxide, when respiration occurs. The respiratory system works with the circulatory system to distribute the oxygen to the body.
The grasshopper population can significantly decrease, as grasshoppers are considered pests, since they eat crops. Humans get rid of them so they won't eat all of our crops and plants.
Some crayfish are endangered now, as they are a food source to humans. We catch them with nets and traps, and so their populations have also decreased significantly.