Name _________________________________________ Date _____________________
NOTES: THE DIGESTIVE SYSTEM & ENZYMES
Nutrients…

Are substances in food that provide _______________ and materials for cell
development, ______________, and ______________.
Classes of Nutrients
o Carbohydrates: main source of ________________________
o Proteins: used for _________________. Made of ______________.
o Fats: provide _____________ (stored) and help body absorb
__________.
o Vitamins: organic nutrients that help your body to use other ________.
o Minerals: Inorganic nutrients that regulate many _______________ in
your body.
o Water: Most vital factor for survival, other than _____________.
Water enables ____________________ to take place in your cells.
Enzymes
Enzymes are molecules that _________________________________
They do this without ________________ or _______________.
Enzymes also speed up reactions by _______________________ necessary
for a chemical change to begin.
_______________ is a starch-degrading enzyme secreted in the mouth. This
enzyme breaks down _______________.
_____________, found in the stomach, causes complex proteins to break down
into less complex proteins.
Enzymes are also responsible for MANY chemical reactions in your body---not
just the ones involved in ____________________!
Parts of the Digestive System
Mouth: Begins __________ & _____________ digestion, glands in mouth
produce saliva which contains ___________, which breaks down starch.
Esophagus: _________ _________ that connects throat to stomach. Moves
food down by squeezing (__________________)
Stomach: muscular ___________ where chemical and mechanical digestion
continue; food stays here _________, changes to ________
Small Intestine: tube nearly __________ long where digestive juices from
__________________ are added; ___________ absorb molecules from chime
Pancreas: a small organ that produces substances that stop the action of
____________, makes _________ that break down carbohydrates
Large Intestine: absorbs __________ from undigested food, where
unabsorbed materials become _____________
Liver: produces ________, which is stored in gall bladder. Bile breaks up large
particles of _____ into smaller particles.
Gall Bladder: small ________ that stores _________ produced by liver.
Rectum: where muscles _________ the ________________ from the body.