There are many differences between humans and cows. But the most notable difference is the digestive system. Cows have a digestive system that enables them to eat and digest plant matter (fibre, cellulose, hemicellulose, starches, etc.) more efficiently than humans. It is this difference that makes cows able to eat roughage and coarser forages than what humans are able to chew through. Humans, on the other hand, are more able to digest animal proteins more efficiently than cows. Essentially, cows are herbivores and humans are omnivores by natural selection and evolution.
Cows are ruminants, which means they have one large stomach with four compartments that enable coarse plant matter to be digested and broken down in four steps, starting in the reticulum, which collects hardware and other things that cannot be digested or passed through the animal, followed by the rumen, which is a fermentation vat that breaks down fibrous material with the work done by microflora. The omasum absorbs the excess "water" from the digested material, and then further digested by the abomasum, with enzymes to digest proteins and starches.
Humans are monogastrics, which only have one stomach with one compartment. Enzymes or peptides are designed to help break down proteins and starches, but not fibre or cellulose. Proteins stay in the stomach longer because they are being broken down more efficiently. Plant matter passes through more quickly because it can't be digested as efficiently. The only real benefit with fibrous matter is that it helps with healthy bowel movements.
Cattle also have a large functioning cecum that is used to further break down fibre that was missed being broken down in the rumen. Humans, on the other hand, have what is supposed to be a cecum that actually has no significance to the human's digestive system: the appendix is just a useless piece of skin attached to the large intestine that does nothing except cause pain when it gets infected.
Difference between a human being and an elephants digestive system?
nothing, a fish is slightly smaller
one is a turtle and the other is straight
Koalas have a system that helps them digest the eculeptas leaves but we do not.
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There are many differences and similarities between a perch and a human in the digestive system. One is the enzymes found in the gut.
Well, clams filter feed, so I don't think they actually have digestive systems at all. I would imagine, with all the stuff floating in seawater, that they simply absorb nutrients out of the brine they filter through themselves.
The major difference between the vascular system of a human and a starfish is that humans have cardio vascular system and starfish have water vascular system.
The poultry digestive system is similar to that of a human. The cow's digestive system is designed so that it chews its cud several times to get the maximum nutrition from it.
The human digestive system when stretched out end to end is about 30 feet long.
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The difference between a human-made system and a "natural" system will depend entirely on what the system is. In many cases the human system will be simpler and have a narrow focus.