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External Shark Anatomy - Coggle Diagram
External Shark Anatomy
Fins
Caudal Fin
There is 2 lobes: a large dorsal lobe and smaller ventral lobe. (Tail) Used for propulsion 
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Pectoral Fin
short and broad, not reaching the first dorsal fin base when folded back
Sensory
Ampullae of Lorenzini
help a shark sense prey by detecting the electrical fields generated by activities of the prey
Lateral Line
responsible for alerting a shark to potential prey and predators
Provides oxygen
Gill Slits
do not have gill covers like bony fish. The shark is able to breathe with these gills by swimming or staying in a current
Spiracles
opening behind the eye, used to provide oxygenated blood directly to the eye and brain through a separate blood vessel.
Other Structures
Snout
In their snout they have 2 nostrils for breathing and their snout is long and pointed
Fin Spine
Two large, sharp, mildly poisonous dorsal spines are located in front of each dorsal fin. The spiny dogfish uses its spines defensively by curling up its body and striking at an enemy
Extra Questions
What benefit would the placoid scales have to a sharks swimming ability?
They allow the shark to swim easily through the water
How would bringing water to the gills when the mouth is closed benefit a bottom dwelling shark or ray?
It allows them to have a greater exchange of oxygen and carbon dioxide, brings oxygen to brain and other systems so they dont have to go to the surface to get oxygen
What is Ovoviviparous?
producing young by means of eggs that are hatched within the body of the parent
Whats Oviparous?
producing young by means of eggs that are hatched after they have been laid by the parent
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