Botulism toxin disrupts motor control by Select one: A. causing demyelination of

Question

Botulism toxin disrupts motor control by Select one: A. causing demyelination of motor neurons. B. blocking inhibitory signals to motor neurons. C. killing motor neurons. D. blocking the release of acetylcholine by motor neurons. E. blocking acetylcholine receptors on muscle cells. How does tetanospasmin affect motor control? Select one: A. It blocks the release of inhibitory neurotransmitters in the CNS. B. It is a pyrogenic toxin. C. It induces nervous system proteins to fold into abnormal shapes. D. It blocks the secretion of acetylcholine into the synaptic cleft. E. It triggers the endocytosis of skeletal muscle cells. Listeria monocytogenes pathogenesis is directly related to its ability to Select one: A. produce a polysaccharide capsule. B. form endospores. C. produce a powerful toxin. D. resist most antimicrobial agents. E. live and reproduce inside its host's cells.

Explanation / Answer

1. Botulinum toxin is released by a bacteria Clostridium botulinum. This toxin is a natural neurotoxin and it blocks the ability of motor neurons resulting in no secretion of acetylcholine by them. Abence of acetylcholine results in flaccid paralysis in whih muscles become unresponsive.

So the correct answer is option D.

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