Answer:
Option B, Unlike the crab, the fish's axons are wrapped in myelin.
Explanation:
Options for the question
A) The fish's axons are smaller in diameter; small axons transmit action potentials faster than large axons do.
B) Unlike the crab, the fish's axons are wrapped in myelin.
C) There are more ion channels in the axons of the crab compared with fish axons.
D) Unlike the crab, the fish's axons are wrapped in myelin, and the fish's axons are smaller in diameter; small axons transmit action potentials faster than large axons do.
solution
The signal conductivity of an axon increases when it is coated with an insulating material. Myelin is layer of fatty substance that insulated the axon and hence increases its conductivity by reducing or stopping the loss of ions responsible for conducting information. Not only this myelin also reduces the capacitance of the neuron by reducing the agitated negative ions which in turn attracts the positive ion.
Hence, option B is correct
The most likely explanation is that unlike the crab, the fish's axons are wrapped in myelin.
The neurophysiologist is a medical doctor that specialised in the area of nervous system and its functions.
The neurons or nerve cells generate and conduct impulses in the nervous system.
Nerve reflexes are involuntary response to a stimulus.
Electric signals are transported in a neuron through action potentials.
The axon of the nerve cells of fish is covered by myelin sheath which is not found is crab.
The crab is an example of an animal that belongs to the non-myelinated taxa (that is, without myelin)
The myelin sheath aids in the rapid transmission of electrical impulses.
Therefore, action potentials are found to pass more rapidly along the fish's neurons than the crab.
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