Which organism is responsible for a bite that can lead to muscle paralysis?

The Eastern coral snake is known to cause muscle paralysis primarily due to its neurotoxic venom. This snake's venom contains components that disrupt neuromuscular transmission, leading to paralysis of the muscles. The symptoms can include difficulty swallowing, respiratory distress, and general muscle weakness as the venom affects the motor nerves.

In contrast, while the Western diamondback rattlesnake's venom can cause significant tissue damage and systemic effects, it is primarily hemotoxic rather than neurotoxic. The Black widow spider’s venom contains neurotoxins that can cause muscle cramping and spasms but doesn't primarily lead to paralysis. The Brown recluse spider's bite may lead to necrotic skin lesions and systemic symptoms due to its cytotoxic venom, but paralysis is not a characteristic effect of its envenomation. Therefore, the Eastern coral snake is the organism associated with bites leading to muscle paralysis.