AP10 Digestive System Overview Lecture

digestive

respiratory

circulatory

integumentary

endocrine

breaks down eaten material into nutrient molecules

absorbs water and ions

eliminates undigested residue

absorbs oxygen

produce microbes that help digest certain molecules

a continuous tube; open at both ends

an open tube; open only at the superior end

a closed cavity; surround by membrane

an open cavity; open only at the inferior end

mechanical digestion

chemical digestion

grains of rice

sand particles

molecules

atoms

small pebbles

conduct the food and carry out the digestion, absorption, and elimination

secrete digestive juices that are added to the digestive tract

stomach

liver

esophagus

pancreas

small intestine

glands in the wall of the small intestine

salivary glands

liver

gallbladder

pancreas

chemically digest food into nutrient molecules by the action of enzymes

lubricate the bolus

neutralize stomach acid

aid in the digestion and absorption of fat

chemically digest food into nutrient molecules by the action of acids

chemically digest food into nutrient molecules by the action of enzymes

lubricate the bolus

neutralize stomach acid

aid in the digestion and absorption of fat

chemically digest food into nutrient molecules by the action of acids

increase surface area of the lining of the small intestines allowing more absorption of nutrients

acts like speed bumps to slow the movement of food through the small intestines allowing more absorption of nutrients

all of the organs of the digestive system are part of the digestive tract that food flows through

all organs of the digestive tract perform the same function

areas along the digestive tract are specialized to perform different functions

some organs of the digestive system are accessory organs that add secretions into different areas along the tube

the digestive tract is a continuous tube