Which of the following has no central nervous system?
Correct answer: A. Hydra
- A. Hydra
- B. Man
- C. Planaria
- D. Cockroach
Explanation
Hydra has a diffuse nerve net but no central nervous system, brain, or spinal cord. Planaria, cockroach, and humans all possess central concentrations of nervous tissue, so choosing planaria overlooks its cerebral ganglia and longitudinal nerve cords.
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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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