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Izabella Battonyai
Izabella Battonyai

... that the PC takes part in olfaction processes, it has important role in olfactory information processing and in odor learning and memory formation as well (Gelperin, 1999; Chase, 2002). Although in early electron microscopic studies Zs.-Nagy and Sakharov (1969) identified synapses in the cell layer ...
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Recent advances in understanding molecular mechanisms of

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Unit 22.1: The Nervous System
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... Figure 2. Structure of voltage dependent potassium channel and cylinder represents helical membrane spanning six domains. Rising phase of the action potential is caused by the fast inactivating and transient current flowing through the sodium channels. Agents that block these fast inactivating chann ...
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Neurotoxin



Neurotoxins are substances that are poisonous or destructive to nerve tissue. Neurotoxins are an extensive class of exogenous chemical neurological insults that can adversely affect function in both developing and mature nervous tissue. The term can also be used to classify endogenous compounds, which, when abnormally contact, can prove neurologically toxic. Though neurotoxins are often neurologically destructive, their ability to specifically target neural components is important in the study of nervous systems. Common examples of neurotoxins include lead, ethanol (drinking alcohol), Manganese glutamate, nitric oxide (NO), botulinum toxin (e.g. Botox), tetanus toxin, and tetrodotoxin. Some substances such as nitric oxide and glutamate are in fact essential for proper function of the body and only exert neurotoxic effects at excessive concentrations.Neurotoxins inhibit neuron control over ion concentrations across the cell membrane, or communication between neurons across a synapse. Local pathology of neurotoxin exposure often includes neuron excitotoxicity or apoptosis but can also include glial cell damage. Macroscopic manifestations of neurotoxin exposure can include widespread central nervous system damage such as intellectual disability, persistent memory impairments, epilepsy, and dementia. Additionally, neurotoxin-mediated peripheral nervous system damage such as neuropathy or myopathy is common. Support has been shown for a number of treatments aimed at attenuating neurotoxin-mediated injury, such as antioxidant, and antitoxin administration.
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