see it your self

2.  The circulatory system
system consists of
blood,blood vessels and the
heart.

3.  The blood is a specilized bodily fluid that flows
in blood vessels. It transports:
 Digested food from the small intestine to all
parts of body.
 Oxygen from the lungs to the body cells and
carbon- dioxide from the cells to the lungs.
 Liquid waste from the body cells to the kidneys
for removal from the body.

4.  Plasma is the liquid part of the body, It is
yellowish in colour and contains about 90 per
cent of water. It has food, wastes, enzymes,
etc, dissolved in it.
 The three Blood cells RBC,WBC and platelets
float in it.

5.  RBCs:The Red Blood cells are Disc
shaped cells.They contain a red-coloured
protein called Haemoglobin.It is this
pigment that absorbs oxygen and
transports it to the body.
 WBCs:The White Blood cells are larger
than RBC.They are fewer in number than
RBC.Their main job is to fight against
disease by destroying harmful bacteria.
 PLATELETS:Platelets are smaller than
RBC.They help the blood to clot
whenever there is a wound on the body .
This blocks the flow of blood and
prevents blood loss.

6.  Blood circulates across the body through a
network of tubes called the Blood Vessels.
 The Three types of blood vessels are:-
 ARTERIES:-The arteries carry blood away
from the heart.The arteries have thick and
elastic walls to prevent breakeage from
the rapid and high pressure blood.
 CAPILLARIES:- are the thinnest blood
vessels.They have very thin walls through
which oxygen,digested food ,carbon
dioxide and other waste products are
exchanged between the blood and
surrounding cells.
 VIENS:- Viens carry blood back to the
heart,they have thin walls,they have valves
which allow the blood to flow in one
direction only.

7.  The heart is a fist sized
muscular organ located
between the lungs. It is
centrally placed but tilted
towards the left. Its function
is to pump blood to all parts of
the body.
 The heart is divided into four
chambers. The top chambers
are compartively thinner walls
are called Auricles. The two
lower chambers with thick
muscular walls are called
ventricles.

8. RIGHT LEFT
 The right auricle
recieves carbon dioxide
rich blood from various
parts of the body .
 The right ventricle
pumps the blood to the
lungs,where carbon
dioxide is removed and
oxygen is absorbed.
 The left auricle
receives oxygen rich
blood from various
parts of the body .
 The left ventricle
pumps oxygen rich blood
to the rest of the body.

9.  The blood enters the
right side of the heart
and is pumped to the
lungs where it gives up
carbon dioxide and picks
up oxygen. This oxygen
rich blood travels back
to the left side of the
heart.It is again sent to
all parts of the body and
the proccess is repeated
again and again.

10.  Ratna Sagar text book living science 7
 http://quizlet.com/32457539/circulatory-
system-flash-cards/
 http://arditobook.pbworks.com/f/1179110236/
Circul2.gif
 www.homeouniverse.com

11. MADE BY HARSH
GURAWALIYA