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13.4 Electric Fish
The body can build and destroy bone.
A living bone will adapt to a long-term mechanical load.
The bone will assume a new shape after a time when a force bends it.
Some parts of the bone gain substance and others lose it in a way that strengthens the bone in its new position.
The bone may have another function.
The bones have to be nourished by fluids.
Through narrow canals, the fluids move into the bone.
Without a pumping mechanism, the flow of the fluid wouldn't be fast enough to give the bone what it needs.
It has been suggested that the ion in the fluid is pumped out of the bone by the force of the body movement.
Most animals don't have sensory organs that are designed to detect electric fields, but sharks and rays do.
The shark uses electrical organs to locate animals buried in sand and communicate with other sharks.
The electric field generated in the vicinity of the metal is what causes sharks to bite boat propellers.
An equally remarkable use of electricity is found in the electric eel, which can generate along its skin electric pulses up to 500 V with currents reaching 80 mA.
This ability can be used as a weapon.
When it comes in contact with its prey, the high-voltage pulse travels through the victim and stuns it.
The electric organ of the eel is made of specialized muscle fibers.
The number of ion entering the axon during the action potential is calculated per meter of nonmyelinated axon length.
The number of ion per meter length of the axon is calculated from the data in Table 13.1.
Show that Eq.
using the binomial theorem.
The size of the cell is 10-5 m, the pulse produced by a single cell is 0.1 V, and the duration of pulse is 10-2 seconds.
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