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 the song "Something Good", which contains the lyrics: "Nothing comes from nothing / nothing ever could". Although the song is devoid of intentional metaphysical connotations, Maria's time in Nonnberg Abbey would have familiarized her with the phrase, which is used in Catholic philosophy to explain God's gratuitous act of , namely, that only the source of all being can give creation its existence. Earlier in the film, in the well-known song "Maria", Maria's fellow nuns lament that there is "many a thing she ought to understand" and that she is "not an asset to the abbey". It is unclear if