Cardiac glycoside specifically categorized based on the plant they are derived from, as in the following list. For example, cardenolides have been primarily derived from the foxglove plants "Digitalis purpurea" and "Digitalis lanata", while bufadienolides have been derived from the venom of the cane toad "Bufo marinus", from which they receive the “bufo” portion of their name. Below is a full list of plants from which cardiac glycosides can be derived. Cardiac glycosides affect the sodium-potassium ATPase pump in cardiac muscle cells to alter their function. Normally, these sodium-potassium pumps move potassium ions in and sodium ions out. Cardiac glycosides, however, inhibit
Nothing comes from nothing Nothing comes from nothing Nothing comes from nothing () is a philosophical expression of a thesis first argued by Parmenides. It is associated with ancient Greek cosmology, such as is presented not just in the works of Homer and Hesiod, but also in virtually every internal system—there is no break in-between a world that did not exist and one that did, since it could not be created in the first place. The idea that "nothing comes from nothing", as articulated by Parmenides, first appears in his "Physics": The above, in a translation based on the John Burnet translation, appears as