Saxitoxin (STX) is the most well -known paralytic shellfish toxin caused by the phenomenon known as "red tide." Which statement below best describes why this neurotoxin causes paralysis?
A) It acts by blocking voltage -gated sodium channels which are needed to generate an action potential.
B) It acts on the hypothalamus of the brain, shutting down all neurological functions.
C) It prevents the synaptic vesicles from migrating to the axon terminal; therefore, no action potentials are generated.
D) It blocks ligand -gated channels on the postsynaptic membrane, which blocks signals leaving the central nervous system.
E) It acts on the potassium channels within a neuron, hyperpolarizing the cell membrane; therefore, no action potential can be generated.

Question

Quizplus · Accepted Answer

Saxitoxin causes paralysis by blocking voltage-gated sodium channels, which are essential for the generation of action potentials in neurons. This blockade prevents the initiation and propagation of electrical signals, leading to paralysis.

Saxitoxin (STX) Is the Most Well -Known Paralytic Shellfish Toxin