1. Injecting cyanide

While injecting a hypnotic agent to make the patient fall asleep, injecting cyanide resulted in the death of the patient. Principle of action of cyanide: Since human cells do not contain chlorophyll, food must be ingested outside the body to maintain body temperature, muscle contraction and stretching, in order to extract energy from food, the human body secretes another enzyme NAD, NAD and hydrogen from food Combined to form NADH2, it replenishes energy to the human body. The used up hydrogen combines with the inhaled oxygen to become water.

2. Inject a large dose of anesthetic

Put the patient to sleep, and then inject a central anesthetic that has a respiratory depressant effect. The anesthetic here usually refers to some powerful sedative drugs that can cause suffocation. A certain amount of anesthetics can inhibit the nerve center. Sleeping pills are originally used to improve sleep quality, but they generally only play an auxiliary role here, usually just to make the patient fall asleep. Afterwards, a powerful anesthetic is injected to suppress the human respiratory system, and eventually the person dies due to respiratory arrest due to the anesthetic.

3. Injection of coagulants

The main mechanism of action of coagulants is to act on the coagulation factors of blood proteins in the human body, causing blood to coagulate, forming thrombus, and causing obstruction of blood vessels. (Normal coagulation factors only come into play when bleeding occurs and can ensure normal hemostasis.) After being affected by coagulants, they become active and automatically coagulate into blood clots in blood vessels, blocking blood flow and causing death.