Which of the followings is missing from the nervous system of planaria_____________?
Correct answer: D. none of these
- A. Ganglia
- B. Longitudinal nerves
- C. Lateral nerves
- D. none of these
Explanation
Planaria has cerebral ganglia, paired longitudinal nerve cords, and transverse lateral connections, giving it a ladder-like nervous system. Students may choose ganglia because planaria is a simple animal, but it does possess a pair of anterior cerebral ganglia.
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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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