9.our body

OUR BODY
By Aniruddh Kommajosyula
III C
Delhi Public School, Nerul

Our body has different parts.
Each body part does something special, something
only it can do.
Our body is made up of many parts. The different
parts of the body are also called its organs.

SENSE ORGANS
 The organs which help us to feel or sense things around us are
called as Sense Organs.
 These organs work together. These organs take messages from
the outside world. Then they send messages to the brain
through the nerves. After receiving the messages from the
sense organs, the brain passes
orders to different organs of
body. Then the body works
according to the orders.
 Eyes: Sense of sight
 Ears: Sense of hearing
 Nose: Sense of smell
 Tongue: Sense of taste
 Skin: Sense of touch

WHAT IS OUR BODY MADE UP OF
 Our body is made up of many small parts called cells.
 Cells are the building blocks of the body.
Cells are the
smallest part
of our body.
A tissue is made
up of many
similar cells.
An organ is made
up of different
tissues.
A group of organs
form an organ system
Eg. digestive system.
An organism or a
living being is made
up of different
organ systems.

HUMAN BODY SYSTEMS
 The organs of our body are grouped together to form a
system. These systems help the body to do special types of
work.
 There are eight main systems in our body:
 Skeleton system provides form, shape and support to our
body.
 Nervous system sends orders to different organs of the body
for action.
 Muscular system helps to move about and do diffeent kinds
of work.
 Respiratory system supplies oxygen to the body.
 Digestive system helps in taking food and making it ready
for use by the body.
 Excretory system helps to remove waste materials out of
the body.
 Circulatory system helps in the movement of blood to
different parts of the body.
 Reproductive system helps to produce young ones

THE SKELETON
The soft parts of human body are Muscles.
The hard parts of the human body are Bones.
The bones in our body forms a framework.
This framework of bones is called the skeleton.
It gives shape and support to our body.
Without the skeleton, we would not be able to stand
straight.
Note: framework:-The strong part of something that
gives it shape.

BONES
 Bones are hard and stiff.
 They protect the soft inner body parts.
 There are more than 200 bones that form our skeleton.
 In a baby, there are about 300 bones. As the baby grows
there are only 206 bones since some bones join together.
JOINTS
 The place where two or more bones are joined together is
called a joint.
 We can bend our body around the joints.
 Some types of joints are: Elbow joint, Neck joint, Wrist
joint, Shoulder joint etc.

MUSCLES
 Our bones are covered with muscles.
 Muscles help us to move our bones.
 There are more than 600 muscles in our body.

EXCERCISE
 The bones and muscles of our body work together to
help us move, work and play.
 We must eat healthy food and exercise every day to make
our bones and muscles strong.
 Strong bones and muscles allow us to work and play
without feeling tired.
 Posture:
 The position of our body when we stand, sit, or walk is
called posture.
 We should always keep a straight and upright posture.
 A good posture helps us to stay healthy.
 It keeps our body in proper shape.

ORGAN SYSTEMS
AN ORGAN SYSTEM HAS MANY ORGANS THAT WORK TOGETHER TO
PERFORM ONE ACTION.
Skeletal system Muscular system
 The bones in the body
make up the skeletal
system.
 This system gives shape
and form to our body
 It also protects the inner
body parts from getting
injured.
 There are 206 bones in
our body.
 All the muscles together
form the muscular
system.
 Muscles help us to move
the different parts of our
body.
 There are more than 600
muscles in our body.

Skull
Ribs
Backbone
Joints
Face muscles
move to make us
smile, frown,
talk, etc.
Arm muscles
shorten and
lengthen to
move the arm
up and down.
Leg muscles
shorten and
lengthen to
move our legs.
Skeletal System
Muscular System

Digestive system Respiratory system
 The food that we eat
gets digested inside
our body.
 The process of
changing food into
substances that our
body can use is called
digestion.
 The organs which help
us do this form our
digestive system.
 The air that we breathe through
our nose is called inhaled air.
 This air goes down the windpipe
and reaches the lungs after which
the air is breathed out.
 The air we breathe out is called
exhaled air.
 The nose, the windpipe, and the
lungs together form our
respiratory system.
 Exhaled air is impure as it has less
oxygen and more of a gas called
carbon dioxide.

Mouth we take
in food through
our mouth.
Food pipe food
passes down the
food pipe.
Stomach it is
the organ
where the food
gets mixed
thoroughly.
Intestines the
intestines take
in or absorb
what is needed
from the food.
anus the undigested
food is thrown out
through the anus.
Nose we take
in air through
our nose.
Windpipe air
goes down the
windpipe.
Lungs the
air reaches
the lungs
and the
lungs
expand .
Diaphragm
Digestive
System
Respiratory
System

Nervous System Circulatory System
 The brain, the spinal
cord, and the nerves
make up our nervous
system.
 The brain gives
instructions.
 It has nerves that take
these instructions to
muscles, bones and other
body parts.
 The spinal cord connects
all nerves of the body to
the brain.
 Our body cannot work
without heart.
 Our heart pumps blood to
all organs of the body.
 This blood is carried by
blood vessels (thin tubes
through which blood flows)
to all parts of the body.
 The heart, the blood and
the blood vessels make up
our Circulatory System.
 The heart is made up of
only muscles!

Brain
Spinal Cord
Nerves
Heart pumps
blood to big
blood vessels.
The big blood
vessels branch
off and go to all
parts of the
body.
Nervous System
Circulatory System

Excretory System Reproductive System
 Excretory System
cleans our body by
throwing out body
wastes like urine,
sweat etc.
 The Reproductive
System helps in
producing young
ones.

9.our body

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9.our body