How does the structure of the small intestine it to perform its function?
a
bile from the liver is secreted into the small intestine to make the absorption of nutrients more efficient.
b
involuntary muscles of the small intestine contract to make the absorption of nutrients more efficient.
c
salivary glands deposit saliva into the small intestine to make the absorption of nutrients more efficient.
d
villi in the small intestine have thin-walled capillaries to make the absorption of nutrients more efficient.