Four layers of tissue form the walls of the digestive tract. These layers are called mucosa, submucosa, muscularis externa and adventitia.
mucosa
In the walls of the tract organs
digestive tract
true
They feed off the inner walls of the digestive system.
Peristalsis.
short reflexes
It passes through the wall of the digestive system, then into the blood.
no this is smooth muscles
the digestive system breaks down the food, anything which is vital to the body is passed through the intestine walls, ( im not sure which, i believe it is small ). The nutrients are passed through the intestine walls and into the blood stream
by peristalsis which is the rhythmic, involuntary contraction of the smooth muscles in the walls of digestive organs.