Cellulose is just a polysaccharide composed of glucose. If we had the digestive enzymes to break down cellulose into glucose, it would just mean tha we can get more energy from our diet without turning the cellulose into "roughage." Cows have a symbiotic relationship with certain kinds of bacteria that make the digestive enzymes. This is why cows and some other animals can break down cellulose and eat grass. If we had the enzymes to break down cellulose, we too would be able to eat grass!
vegetables contain cellulose and the human body cannot digest that
Try it son. Send us the pictures!!
Humans are animals, and animal cells lack a cell wall. Now, as for digesting cellulose, which "is the structural component of the primary cell wall of green plants" (Wikipedia); the human body lacks the enzyme necessary to break down cellulose. Therefore, since the human body neither has it nor can digest it, cell walls are quite useless (from a biological perspective).
Because cattle are ruminants and cellulose is broken down by the microbes found inside of the rumen and then digested further in the cecum. Humans do not have a multiple-chambered stomach nor a functional cecum, thus making digesting cellulose impossible. Cellulose only acts as a gut filler for humans, which is the main reason why plant matter passes through so quickly (in around 2 hours) in a human's digestive tract compared to meat, and compared to the time it takes plant matter to go through a cow's digestive tract.
Cellulose is indigestible to humans because it acts as a hydrophyllic bulking agent to human feces. It is consist of non-starch polysaccharides. Its a soluble fiber, that's why cellulose is indigestible.
It seems we lack enzymes that are capable of breaking down cellulose.
Humans lack the necessary enzyme to digest cellulose, so it acts as roughage in the intestines and helps with the digestion process
Humans cannot break down cellulose because it contains beta glucose and the enzymes that humans have cannot break down beta glucose.
Celulose. Some humans also cannot digest lactose aka someone who is lactose intolerant.
HUmans haven't got the digestion system needed to break down cellulose into nutrients. Animals, with longer intestines can.
Rabies can infect humans if the human is bitten by a rabid animal. --It infects humans, but it does NOT effect them the same way it effects animals. Not an answer to the question.
humans cause global warming and pollution