Transcript File

Your body takes in nutrients and
oxygen to keep you alive
 Your
body is made of different systems,
and each of these systems has a job to do
 Your
digestive system breaks down food
into nutrients
 Your
respiratory system takes in oxygen
that your body uses to get energy from
nutrients
 Did
you know your body is made of many
systems?
 What
systems do you know of?
 Each
body system
is made of parts
that work together
to do a job
 Here are 4 major
ways your systems
are organized
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Cells
Tissues
Organs
Systems
 Cells
are the smallest parts of your body
 Your body is made of billions and billions
of cells
 Many cells have special jobs
 A muscle cell is one type of cell
 Most
cells form groups, these groups are
called tissues
 All the cells in a tissue are similar in
shape and do a similar job in your body
 Muscle cells form muscle tissue
 Different
groups of
tissues form organs
in your body
 An organ carries out
one or more jobs in
your body
 Your stomach is an
organ
 Muscle tissue is one
of the tissues in your
stomach
Your organs
work together in
body systems
 Each body
system has one
main job to do to
help you stay
alive and healthy
 Your stomach is
one of the organs
in your digestive
system

 Your
digestive system has an important
job of processing food so that your body
can use it
 This process of food is called digestion
 During
digestion, the food you eat is broken
down into smaller and smaller pieces
 At the end of digestion, the cells in your
body get the nutrients they need to stay
alive and grow
 What are some nutrients you know of?
 The
mouth is the beginning of the digestive
system.
 Its job is to break down the food so it can be
swallowed.
 Saliva mixes with the food in your mouth so it
is easy to swallow
As you swallow,
the mixture of
food and saliva
moves down the
esophagus
 The esophagus is
a long tube that
runs from your
mouth to your
stomach
 There are
muscles that
squeeze the food
so it moves down

 The
next stop! The stomach
is a pear shaped organ at
the end of the esophagus
 It gets bigger as you fill it
with food
 Strong chemicals from the
stomach break down the
food even more
 Once
the food is a liquid form it squirts
into the small intestine
 The small intestine is a long, thin tube
that winds back and fourth
 Chemicals flow into the small intestine to
help break down food even more
 The
chemical juices that enter the small
intestine are from the pancreas and liver
The liver is an organ that
helps break down the fats in
the food
 Once the food is broken
down, it can pass into the
cells of the small intestine
and into the blood stream

 When
the
nutrients have
passed into the
cells, there is
waste left over.
 These nutrients go
to your large
intestine, which is
another tube
which is larger
and shorter
 The
colon squeezes most of the water out of
the wastes.
 This water is put back into your body
 The solid wastes that are left exit through
the lower part of your body called the
rectum
 Your
body needs
nutrients and water
to stay alive and
healthy
 Oxygen is a gas
found in the air you
breathe
 Your body needs
the oxygen to
release the energy
from the nutrients
 How
does your body get oxygen?
 Through
the respiratory system
 The
main organs of the
respiratory system are
the mouth, nose,
trachea, and lungs
 These organs are
designed to deliver
oxygen to your cells
 Breathing
is called inhaling
 The air travels down your throat into a
tube called the trachea, also known as the
windpipe (rings)
 There
is a flap over the
trachea. Why?
 The bottom of the
trachea divides into
two branches
 Each of these branches
goes into a lung
 You
have two lungs
 Each lung is a spongy organ in your chest
the sits inside your ribs
 Each of these branches divides into
smaller and smaller branches
 At
the end of the branches there are tiny
air sacs, this is where the oxygen is
picked up and carried to the cells in your
body by your blood
 Just
below your lungs, there is a muscle
called the diaphragm
 This muscle helps you breathe
 Your
respiratory system has another job
to do than just bring oxygen in
 What is that?
 Take Carbon Dioxide and water out
 This
carbon dioxide and water is waste
that your body will not use
 This waste water can be exhaled out
which is why your breath is moist
 Carbon
Dioxide is a gas
 It is harmful to your body, so it must
remove it quickly
 Breathing out is called exhaling
 The
diaphragm helps move the air in and
out of your lungs
 When you breath, the diaphragm
contracts and moves down
 This downward movement expands the
ribcage
 The expansion draws, or pulls in air
 When
the diaphragm relaxes and moves
up, you breath out