Today I’m going to talk about: Poison
I’ve divided my presentation into two parts:
First I’d like to introduce the poison and second I’ll present of same
kinds of poison.
So, let’s start with introduce
Poison, any substance that produces disease conditions, tissue injury,
or otherwise interrupts natural life processes when in contact with or
absorbed into the body. Most poisons taken in sufficient quantity are
lethal. A poisonous substance may originate as a mineral, vegetable, or an
animal, and it may assume the form of a solid, liquid, or gas. A poison,
depending on the type, may attack the surface of the body or, more
seriously, internal organs or the central nervous system.
Finally let’s consider: with kinds of poison
Poisons in humans are usually classified according to their effects as
corrosives, irritants, or narcotics; the last named are also known as
systemic or nerve poisons.
Corrosives include strong acids or alkalis that cause local tissue
destruction, externally or internally; that is, they “burn” the skin or the
lining of the stomach. Common or so-called household corrosive poisons
include hydrochloric acid, carbolic acid, bichloride of mercury, and
ammonia.
Irritants such as arsenic, mercury, iodine, and laxatives act directly