ppt

1. Teaching of science

2. -
PUPIL TEACHER ROLL NO.- 57952
CLASS- 7th
SUBJECT- SCIENCE
DATE- 26
TIME-
-

3. PREVIOUS KNOWLEDGE TESTING
Q.1 What do we need to live?

4. PREVIOUS KNOWLEDGE TESTING
Q.1 What do we need to live?
Q.2 From where we get oxygen?

5. PREVIOUS KNOWLEDGE TESTING
Q.1 What do we need to live?
Q.2 From where we get oxygen?
Q.3 Which gas we give out during
breathing?

6. PREVIOUS KNOWLEDGE TESTING
Q.1 What do we need to live?
Q.2 From where we get oxygen?
Q.3 Which gas we give out during
breathing?
Q.4 How food and oxygen reaches
different parts of the body?

7. Announcement of topic
Human circulatory
system
 The heart, blood vessels and the blood

8. Circulatory system
Definition:
The organ system of the human being
which is responsible for the transport
of materials inside the body is called
circulatory system.

9. Parts of the circulatory system
1 The heart
2 The blood vessels
3 The blood

10. The HEART
It is a conical and highly muscular
hollow organ situated in the chest.
It is approximately equal to the
size of fist of left hand. Heart
circulate the blood in our body.
It consists of the following
Parts
1 Chamber
2 Layers of heart
3 valves

11. Four chambers
The heart is four chambered structure.
1 Right atrium:
The right atrium receives
the deoxygenated blood
from all parts of the body . It
pumps this blood into right
ventricle.
2 Right ventricle:
it pumps the
deoxygenated blood to the
lungs

12. FOUR CHAMBER
Left atrium:
It receives oxygenated
blood from the lungs
through pulmonary veins. It
pumps this blood into the
left ventricle.
Left ventricle:
The left ventricle pumps
the oxygenated blood the
distant organs in the body.

13. Four chambers
Each atrium communicate with the
ventricle of its side by a pore which is
guarded by valves. This valves allow the
blood to flow from the atrium to the
ventricle . Thus in the heart there is a
complete separation of oxygenated and
deoxygenated blood.

14. Layers of the heart wall
• There are three layers of tissue form
the heart wall
 Epicardium layer:
The outer layer of the heart wall is
the Epicardium.
 Myocardium:
The middle layer is myocardium.
 Endocardium:
The inner layer is Endocardium

15. Valves of the heart

16. Valves of the heart
Bicuspid valve:
This valve allow the deoxygenate
blood to flow from the right atrium to the
right ventricle.
Tricuspid valve:
This valve allow the oxygenate
blood to flow from the left atrium to the left
ventricle.

17. Sectional Recapitulation
 Q.1 the circulatory system consists of the
heart , the blood vessels and ---------.

18. Sectional Recapitulation
Q.1 The circulatory of the system consists of
the heart , the blood vessels and ---------.
Q.2 The heart consist of ------------
Chambers.

19. Sectional Recapitulation
Q.1 The circulatory of the system consists of
the heart , the blood vessels and ---------.
Q.2 The heart consist of ------------
Chambers.
Q.3 The right atrium receives the ----------
blood.

20. Sectional Recapitulation
Q.1 The circulatory of the system consists of
the heart , the blood vessels and ---------.
Q.2 The heart consist of ------------
Chambers.
Q.3 The right atrium receives the ----------
blood.
Q.4 The left atrium receives oxygenated blood
from the lungs through ------------.

21. The blood vessels
2. Blood Vessels -A network of tubes
Arteries- carry the oxygenated blood from the
heart to the different regions or organs.
Capillaries –the capillaries have thin walls so as
to enable very tiny molecules to diffuse in and
out. The capillaries rejoin to form a vein. Thus a
network of capillaries forms the connection
between arteries and veins.
Veins- veins carry impure or deoxygenated blood
collected from the different regions to the heart

22. The BLOOD
A. Plasma
About 55% of the blood is a
pale yellow watery fluid
called plasma
Plasma consist of in
which substances such as
glucose, amino acids,
sodium, waste product and
carbon dioxide are
dissolved.

23. The BLOOD
B. Red Blood Cells
Carry hemoglobin
and oxygen. Do not
have a nucleus and
live only about 120
days.

24. THE BLOOD
C. White Blood cells
Fight infection and are
formed in the Bone -
Marro.
White blood cell “eat
up bacteria and germs.
The ratio of RBC to
WBC is 1:500.

25. The Cardiovascular System
The Blood
D. Platelets.
Platelets are tiny
fragments of cells.
Platelets help the
blood to form clots at a
bound side so excessive
loss of blood may be
prevented

26. FINAL RECAPITULATION
Q.1 _______%of the blood is plasma.

27. FINAL RECAPITULATION
Q.1 _______%of the blood is plasma.
Q.2 Red blood cells carry hemoglobin and
________
.

28. FINAL RECAPITULATION
Q.1 _______%of the blood is plasma.
Q.2 Red blood cells carry hemoglobin and
_______.
Q.3 White blood cells are formed in the
_______.

29. FINAL RECAPITULATION
Q.1 _______%of the blood is plasma.
Q.2 Red blood cells carry hemoglobin and
________.
Q.3 White blood cells are formed in the
_______.
Q.4 The veins carry _______ blood collected
from different regions to heart.

30. Q.1 Draw a diagram of the human heart and
label the various part.
Q.2 Differentiate between arteries and veins.

31. Thank you