Tetrodotoxin is a poison that blocks voltage-gated Na+ channels. If experimental

Question

Tetrodotoxin is a poison that blocks voltage-gated Na+ channels. If experimentally, Tetrodotoxin were injected into the pituitary infundibular stalk of an animal, the most likely result would be that hormones would cease to be released from the _____ pituitary because hypothalamic neurons fail to _____. a. Anterior.... Signal their pituitary terminals b. Anterior.... Secrete releasing hormones from their terminals c. Posterior.... Secrete releasing hormones from their terminals d. Posterior.... Signal their pituitary terminals

Explanation / Answer

ans. d

Hypothalamic neuron directly release their secretion into posterior pituitary passing through infundibular stalk.

so after injecting terodotoxin to infundibular stalk it will cease to release the hormone beause it will fail to signal their pituitary terminals..

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