What effects does hemlock have on victim?

Hemlock contains poisons that affect the transmission of nerve impulses to muscle. Death occurs by respiratory failure.

Explanation:

Hemlock is a very poisonous plant. In fact, all parts of the plant are toxic. Hemlock is most poisonous during the early stages of growth in the spring, but it is dangerous at all stages of growth. The poisons in hemlock are so deadly that people have died after eating game birds that had eaten hemlock seeds.