Hydra has___________?
Correct answer: C. Neuron-cells
- A. Brain
- B. Nerves
- C. Neuron-cells
- D. All of these
Explanation
Hydra has a diffuse network of nerve cells, called a nerve net, but it has no brain or central nervous system. The likely mistake is selecting all of these by assuming every animal with neurons also has a brain.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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