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Internal structures

Across
Nerve center of a fish
Pumps blood through the fish
Helps fish move through water
Helps break down food
Absorb nutrients and water in to the blood stream
Creates juices to help digest food
Opening that releases waste from fish
Keeping things balanced inside of an organism
Male reproductive organ
Bones that protect the spinal cord
Large fin at the tail that is primary source of movement
Down
The substance that fish live in
What sharks add to their urine to help regulate salt
Number of chambers in a fish heart
Helps maintain homeostasis by regulating amount of salt and water in the blood
Holds gas to help the fish remain buoyant
The substance that shark bones are made out of
Large fin on the back of fish
Performs gas exchange with water
The chemical formula for salt