Digestive, Circulatory, and Respiratory Systems

set of metabolic reactions & processes
that take place in cells of organisms to
convert energy from nutrients into ATP
(adenosine triphosphate ), & then
release waste products.
Formula
C6H12O6 + 6O2

Glucose +Oxygen
6CO2 + 6H2O + ATP
Carbon Dioxide + Water + Energy
Through the digestive
system the body acquires the
food it needs to fuel all cells.

Main food source needed
are carbohydrates broken
into glucose molecules.

The cell breaks the glucose into something smaller
and sends it off to the mitochondria. There the
mitochondria uses these smaller pieces with
oxygen to make energy for you.

The heart and vessels are
responsible to pump and
transport all nutrients to all
parts of the body through
tiny vessels called
capillaries.

Things like glucose,
oxygen and carbon
dioxide are able to enter
or exit the tissue or
vessel.

The only way to get
glucose (from the
intestine) and oxygen
(from the lung) to the cells
of your toes, is through
blood vessels.

The blood vessels are
essential in removing
waste products too,
such as carbon
dioxide.



The lungs are necessary to get oxygen into the
body.
In the lungs there are millions of little air sacs
called alveoli that are surrounded by capillaries.
Here, the blood drops off carbon dioxide and
picks up oxygen.

This oxygen will be
taken directly to the
cells. When the oxygen
gets to the cell, the
mitochondria takes it
and begins the process
of cellular respiration.


During this process 36%-38% glucose is released
as energy to complete life’s processes.
68% is used as thermal energy to heat an
organism.



Protein
Essential to Diets
They help
rebuild & repair
cells.


Fiber
Keeps the
digestive system
working properly.
Which is essential
for cellular
respiration.
Carbohydrates
 Essential for cellular
respiration to convert
glucose to energy.
 Grains are a good
source of carbs.