[Action] Block the transmission of nerve impulses to muscles, especially those associated with the diaphragm and breathing [Snake Taxon] elapids, vipers, tropical rattlesnakes, and some North American Mojave rattlesnakes [Component] 
Neurotoxins
A n t i c o a g u l a n t s
C a r d i o t o x i n s
C y t o l y s i n s
E n z y m e s
H e m o l y s i n s
H e m o r r h a g i n s
N e u r o t o x i n s
P r o t e o l y s i n s
T h r o m b o s e s