Date:
Objective:
Questions:
What are the
function of
digestive system?
Function:
 ______________________________ large complex molecules (food) into simpler
molecules (nutrients)
 ___________________________nutrients into bloodstream
 Move leftover food- waste our
Two types if digestion: _______________________________ __________________________
Where does
digestion begin?
Mouth
What
biomolecules
digested
chemically first
and where?
Liver
What biomolecule
digested in the
stomach? How?
Where do
nutrients go after
being absorbed in
a small intestine?
What
biomolecule(s)
digested in the
small intestine?
Esophagus
Muscles contract -food
moves one-way.
Peristalsis.
Salivary ______________
changes starch 
disaccharides
(sugars)
Produces _________
“liquid detergent”
– physically
breaks down fat
(lipids)
Stomach
___________________ &
_____________ break
down proteins
Small intestine
Nutrients _____________
into _______________________.
Peristalsis.
Lipids  __________________
Large intestine
Removes water and
salt.
E.Coli bacteria.
Digestion continues:
Carbs  __________________
Proteins  _______________
_______________
Mechanical digestion (physical change)
Chemical digestion (change)
Mouth
Salivary amylase breaks down starch 
Stomach
Smooth muscles contractions churn
___________________________________ break
food
down proteins
Small intestine
Muscular contractions break down and
Enzymes, bile finish digestion of sugars,
mix food with digestive enzymes, bile
proteins (amino acids) and lipids (fatty
acids)
How do digestive
and circulatory
systems interact?
Systems interact to maintain homeostasis
1. Circulatory: Nutrients get absorbed in the small intestine into the
bloodstream  to all the body cells.
 In cells: nutrients broken down to smaller parts by
____________________________- bags of digestive enzymes and acids.
What is the role
of lysosomes in
the digestion?
What role do
muscles play in
digestion?
How DS interact
with other
systems?
2. Muscular: The muscles help chew and swallow food. The smooth
muscles of stomach contracts to push food through.
3. Endocrine: Makes ________________________________________ to regulate sugar.
4. Excretory: Nutrients absorbed into cells  Cells produce waste 
enter blood stream  travel to kidneys  kidneys filter it out  turn
into urine (waste)
5. Nervous: Sends messages to the digestive system when body is hungry
and when body is full. Signals peristalsis (Physical movement) in the
digestive tract. Signals hydrolytic enzymes/hormones to be distributed.
6. Respiratory: Provides oxygen for the process of cellular respiration to
take place in the mitochondria to convert glucose into ATP.
Summary:
Enzymes - REVIEW
What are enzymes?
Enzymes are ____________________ that act as biological catalysts.
Why are enzymes
necessary?
Without enzymes, chemical reactions will not occur fast enough to sustain life
processes.
What is the active site of
an enzyme?
The area of the enzyme that attaches to the chemical (substrate) undergoing
change.
How do enzymes catalyze
chemical reaction?
Enzymes _____________the
activation energy
needed to start a
chemical reaction:
therefore, enzymes
speed up reactions.
Why are different
enzymes needed by
organisms?
Are enzymes used up in
the reaction?
Summary:
Enzymes are specific to
chemical reaction they
catalyze. They have
unique structures and
functions.
The enzymes remain _____________________when
a reaction is complete
and can assist with the
same reaction over and
over again.