Case Study 2 - Bad Fish A Case of Nervous Tissue Part A...

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Bad Fish: A Case of Nervous Tissue Part A: Which of the following best describes a voltage-gated sodium ion channel? Answer: C; A protein embedded in the cell membrane of a neuron Part B: When a neuron is at rest, the cytoplasmic (inside) side of the cell is _______. Answer: A; Negatively charged relative to the outside of the cell Part C: Depolarization of the neuron occurs when _______. Answer: B; positively charged sodium ions rush into the neuron Part D: Which of the following describes why Dr. Westwood experienced paralysis? Answer: D; The tetrodotoxin prevented the motor neurons from sending signals to skeletal muscle Part E: After recovering, Dr. Westwood decided to learn more about neurotoxins. In conducting his research, he learned about a toxin called batrachotoxin (BTX. BTX also binds to voltage-gated sodium ion channels. Dr. Westwood reviewed experiments with neurons exposed to BTX, which showed that after depolarizing, the membrane potential remained positive for an extended length of time. Repolarization of these neurons was often extremely delayed. Which of the following could help explain this result? Answer: A; BTX prevents voltage-gated sodium channels from inactivating
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Part F: Define the following phrases and terms associated with the signs and symptoms of Dr. Westwood’s TTX poisoning: diaphoresis, motor dysfunction, paresthesias, cyanotic, hyperventilating, bradycardia, gastric lavage, and oxygen saturation.
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