3. Circulatory and respiratory systems - 2 weeks to do circulatory system - This week, do heart, blood vessels above the heart, respiratory system - Table 1 - heart to subclavian arteries - Table 2 ...

Ricin is a natural, highly toxic compound, a byproduct of processing castor beans. If inhaled, injected or ingested, less than a pinpoint of ricin can kill a person within 36 to 48 hours.

Anatomical diagram of Mosura fentoni, showing preserved details of the nervous system in purple, the digestive system in green, and the circulatory system in orange. CREDIT: Art by Danielle ...

Police in Germany have raided the home of a teenage boy suspected of making and storing ricin, a highly toxic and deadly biological warfare agent.. The 16-year-old is accused of producing ...