Bacteria begin to colonise the gut soon after birth, they play a key role in training the immune system to recognise pathogenic and non-pathogenic bacteria. Just having the bacteria there prevents other pathogenic species from taking up the same space and so prevents some diseases. They also produce some vitamins notably biotin and vitamin K and some ferment carbohydrate foods which we could not other wise digest turning them in to short chain fatty acids.
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Bacteria are helpful to us in many ways. One way is by helping us digest our food. They also make vitamins in our digestive tract. They also help make our food by fermenting it, like cheese.
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Peristalsis is a wave-like muscle contraction that helps push food through the digestive system, so even if you're upside down, this process will still occur to move food through your digestive tract properly. The direction of peristalsis is controlled by the muscles in the walls of the digestive tract, not by your body's position.
This is called mucous. You make about one liter per day in the digestive tract. You also make some in the respiratory tract, urinary tract and the reproductive tract. Any system that has a connection to the outside makes mucous. All others (internal organs) make serous fluid as a sort of bath.
The endoderm layer of embryonic tissue forms the lining of the digestive tract. It gives rise to the epithelial cells that make up the inner lining of the gastrointestinal system.
About the same as any other mammal. A large portion of the vegetable material they consume passes through the digestive tract unabsorbed. This indigestible fiber and dead bacteria used in the digestive process make up the bulk of rabbit feces which are then passed through the rabbit's bowels in a conveniently pelleted form.