How can a absurdly small amount of deadly poison, like Botulinum, kill a human?

Question

I can’t understand how a small grain, a speck of toxin can kill a grown adult?

If this has been asked before please redirect me to the post.

In: Biology

Answer 1

for example, many viruses are not organisms, just a protein finding itself a hosting cell so it can regenerate.

other toxins, like cyanide, just disable curtain essential functions. cyanide bonds to hemoglobin (a protein which bonds to oxygen and carries it to the cells. btw it turns red when it bonds to oxygen, which is why you turn blue when suffocating), stopping it from transporting oxygen to the cells, causing a very slow and painful death