The toxins in the Yew Plant (Taxus spp.) inhibit the conduct…

The toxins in the Yew Plant (Taxus spp.) inhibit the conduction of the action potential across the myocardium.  While other toxic effects on cardiac function are very probable, this initial alteration in conductivity would be specifically classified as which type of effect?

TRIVIA BONUS QUESTION WORTH 5 POINTS: It is reported in one…

TRIVIA BONUS QUESTION WORTH 5 POINTS: It is reported in one reference that a minimum lethal dosage of undiluted Ethylene Glycol in a dog is approximately 6.5 mL (some references say 6.6 mL)/kg BW. How many ounces of an antifreeze product containing 25% Ethylene Glycol would a 66-pound dog have to consume in order to equal this minimal lethal dosage of Ethylene Glycol?  NOTE: 1 kg = 2.2 lbs, and there are approximately 30 mL in one ounce.