3. Most electric organs are highly modified cells of what tissue? What two types

Question

3. Most electric organs are highly modified cells of what tissue? What two types of fish did we talk about in class that have electric organs? Which one of these types of fish live the waters of the California coast, including the Channel Islands? Describe how the electric organ works. How much potential can each produce? What is the unit for measuring potential? How much current can each produce? What is the unit for measuring current? What is the major environmental factor contributing to these differences in potential and current? For what purpose are these electric organs used? Did electric organs evolve one time in fish, or multiple times?

Please be detailed!

Explanation / Answer

1. The electric organs are modified cells of a nerve or muscle tissue.

2. Examples of electric fishes are:
Electric eel (Electrophorus electricus )
Torpedo Rays
Electric Catfish

3. Garibaldi fish is seen in the California coast in the Channel Islands, that resembles the angelfish of Florida.

4. Electrocytes are the cells present in these organs which are used for electrogenesis, i.e. the production of electric current or discharge. The cells function by pumping positive sodium and potassium ions out of the cell through transport proteins powered by ATP. To discharge the Electrocytes at the correct time, the electric eel uses its pacemaker nucleus, a nucleus of pacemaker neurons.
Each cell can have a potential of 0.15 V.

5. Unit for measuring electric potential is Joule per Coulomb or Volts.

6. A set of stacked electrocytes in an eel can produce upto 500 Watts or 1 ampere of current.

7. CUrrent is measured in ampere.

8. These are used for communication, navigation, defense and also to spot a fit partner

9. ALthough CHarles Darwin speculated the evolution of electric organs from same or one ancestor, it was later noted that they are not. They evolved multiple times. Like they did at least six times in various teleost and elasmobranch fishes.

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