Apple seeds
Here's a look at the toxicity of apple seeds. Answer: Apple seeds do contain a small amount of cyanide, which is a lethal poison, but you are protected from the toxin by the hard seed coating. If you eat whole apple seeds, they pass through your digestive system relatively untouched. Apple seeds contain amygdalin, which decomposes into toxic benzaldehyde and prussic acid (hydrogen cyanide. However, humans are able to detoxify small amounts of these chemicals. Burazin, Getty Images. Some plants have physical defenses such as thorns, spines and prickles, but by far the most common type of protection is chemical. Over millennia, through the process of natural selection, plants have evolved the means to produce a vast and complicated array of chemical compounds in order to deter herbivores. Many of the known plant defense compounds primarily defend against consumption by insects, though other animals, including humans, that consume such plants may also experience negative effects, ranging from mild discomfort to death. Many of these poisonous compounds also have important medicinal benefits. Others, however, value it as a great attractor of wildlife, especially butterflies. It is poisonous to humans, so do not eat it. The fluffy seeds of milkweed are sometimes used as insulation or stuffing for life jackets.  Below is an extensive, if incomplete, list of plants containing poisonous parts that pose a serious risk of illness, injury, or death to humans or animals. Many of the known plant defense compounds primarily defend against consumption by insects, though other animals, including humans, that consume such plants may also experience negative effects, ranging from mild discomfort to death. Many of these poisonous compounds also have important medicinal benefits. Common Poisonous Plants and Plant Parts. Vegetation helps sustain life. We eat many plants, herbs and so forth in our daily diet. But, we must remember to be choosy. Some plants, trees or shrubs are potential killers of man. Some part of the ornamental plants or flowers in your yard may contain deadly poison. Many poisonous plants are so common and seemingly innocuous you do not suspect their toxic qualities.  1 The seedlings and seeds are the most toxic parts of the plants. 2  Symptoms usually occur within a few hours, producing unsteadiness and weakness, depression, nausea and vomiting, twisting of the neck muscles, rapid and weak pulse, difficulty breathing, and eventually death. Many of the known plant defense compounds primarily defend against consumption by insects, though other animals, including humans, that consume such plants may also experience negative effects, ranging from mild discomfort to death. Many of these poisonous compounds also have important medicinal benefits. 1 The leaves and acorns of oak species are poisonous in large amounts to humans and livestock, including cattle, horses, sheep and goats, but not pigs. 2  Poisoning is caused by the toxin tannic acid, which causes gastroenteritis, heart trouble, contact dermatitis and kidney damage. Many of the known plant defense compounds primarily defend against consumption by insects, though other animals, including humans, that consume such plants may also experience negative effects, ranging from mild discomfort to death. Many of these poisonous compounds also have important medicinal benefits. Milkweed is a natural host of monarch butterflies. Milkweed species in the genus Asclepias contain cardiac glycosides that are poisonous to humans, but they pose the most danger to grazing animals. Humans can eat milkweed, but its toxicity depends on its species, age, how it is prepared and how much is eaten.  Are they poisonous to humans? Here's a look at the toxicity of apple seeds. Answer: Apple seeds do contain a small amount of cyanide, which is a lethal poison, but you are protected from the toxin by the hard seed coating. If you eat whole apple seeds, they pass through your digestive system relatively untouched.
http://chemistry.about.com/od/healthsafety/f/Do-Apple-Seeds-Contain-Poison.htm https://en.wikipedia.org/wiki/List_of_poisonous_plants http://www.fcps.edu/islandcreekes/ecology/common_milkweed.htm https://en.wikipedia.org/wiki/List_of_poisonous_plants http://aggie-horticulture.tamu.edu/earthkind/landscape/poisonous-plants-resources/common-poisonous-plants-and-plant-parts/ https://en.wikipedia.org/wiki/List_of_poisonous_plants https://en.wikipedia.org/wiki/List_of_poisonous_plants http://homeguides.sfgate.com/poisonous-milkweed-humans-74425.html https://www.facebook.com/notes/juicing-recipes/are-apple-seeds-poisonous-/389757567731008
what seeds are poisonous to humans