A doctor is treating a patient N% ith i;mike bite. He should not forget that viper verloril
**Core Concept**
Local anesthetics like viper venom work by blocking sodium channels in nerve fibers, preventing the initiation and conduction of nerve impulses. This is a result of their ability to bind to the sodium channel receptor, blocking the influx of sodium ions into the neuron.
**Why the Correct Answer is Right**
The venom of viper species, such as the saw-scaled viper, contains a neurotoxin that acts as a local anesthetic by blocking sodium channels. This leads to paralysis of the neuromuscular junction, causing respiratory failure, cardiac arrest, and eventually death if left untreated. The toxin binds to the sodium channel receptor, preventing the depolarization of the neuron and thus blocking the transmission of nerve impulses.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the context of viper venom or local anesthetics.
**Option B:** This option is incorrect as it does not specifically relate to the mechanism of viper venom or local anesthetics.
**Option C:** This option is a distractor, as it does not accurately describe the mechanism of viper venom or local anesthetics.
**Clinical Pearl / High-Yield Fact**
When treating patients bitten by venomous snakes, it is essential to administer antivenom promptly to prevent the spread of the venom and minimize tissue damage. Antivenom works by neutralizing the venom, thereby preventing further damage to the nervous system and other tissues.
**Correct Answer: D.**