Why are the gills branched?
As early vertebrates grew larger and developed bony scales or plates between their tissues and the water, they developed gills for taking up oxygen from the water. Gills are complex, highly branched and folded structures; this increases the surface area for taking up oxygen.
How does the location of the nerve cord in the crayfish differ from the location of the nerve cord in humans?
How is it different? The crayfish has a ventral nerve cord that goes from the tail to the head. The nerve cord will lead to a small bundle, which is considered the brain. Crayfish primarily sense with their antennae, compound eyes on stalks, whereas earthworms sense without eyes and use sensors.
What is the advantage of having gills attached to the walking legs?
Each gill has blood vessels running through it and is feathery in nature, providing a large surface area for absorbing larger amounts of oxygen from the water. Move the walking legs and notice what happens to the gills.
Where are the gills attached on a crayfish?
Respiratory System: Being aquatic organisms, crayfish have gills that aid in respiration. These featherlike structures are found underneath the carapace and are attached to the chelipeds and walking legs.
What is the function of crayfish gills?
Gills are external structures that extract free oxygen from the water.
Do grasshoppers have a nervous system?
The central nervous system (CNS) of the grasshopper consists of a brain and a set of segmental ganglia that together make up the ventral nerve cord. Each ventral nerve cord ganglion develops very similarly during early embryogenesis.
Why is the feathery nature of gills important?
A constant flow of blood to the gills releases carbon dioxide and picks up oxygen. The feathery nature of the gills gives them a very large surface area.
What is found underneath the rostrum?
Turn the crayfish with its DORSAL side upward, and locate the rostrum, which is the pointed extension of the carapace at the head of the animal shown in the diagram above. Beneath the rostrum locate the two eyes.
Do grasshoppers have brain?
The grasshopper has a brain located between its eyes, just above the esophagus. The grasshopper can do many things, like walking and jumping, WITHOUT its brain. The brain is used to relay sensory information to other parts of the body and to help with movement.
Why do crayfish have feathery gills?
Locate the gills, which are featherlike structures found underneath the carapace and attached to the chelipeds and walking legs. A constant flow of blood to the gills releases carbon dioxide and picks up oxygen. The feathery nature of the gills gives them a very large surface area.
Why is it important for crayfish to have large gills?
Identifying Relationships The feathery quality of the gills gives them a very large surface area. Why is this important? Gills allow the crawfish to breathe through gas exchange. To increase the efficiency of gas exchange, maximising the surface area allows for more efficient gas exchange.
Do crabs have a Cephalothorax?
The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. In horseshoe crabs and many crustaceans, a hard shell called the carapace covers the cephalothorax.
