Know more.

2. Our pump — the heart
 The heart is a muscular organ as big as our
fist.
 The heart has different chambers to transport
oxygenated and de-oxygenated blood and to
prevent them from mixing.
 The conversion takes place in the lungs

4. WORKING OF A HEART
• Oxygen-rich blood from the lungs comes to
the thin-walled upper chamber of the heart
on the left, the left atrium.
• The left atrium relaxes when it is collecting
this blood. It then contracts, while the next
chamber, the left ventricle, expands, so that
the blood is transferred to it.
• When the muscular left ventricle contracts in
its turn, the blood is pumped out to the body.

5. Working Cont……..
• De-oxygenated blood comes from the body to
the upper chamber on the right, the right
atrium, as it expands.
• As the right atrium contracts, the
corresponding lower chamber, the right
ventricle, dilates.
• This transfers blood to the right ventricle,
which in turn pumps it to the lungs for
oxygenation.

6. ANIMATED VIDEO
• http://www.youtube.com/watch?v=H04d3rJC
LCE
• What happens during a heart attack?
http://www.youtube.com/watch?v=H_VsHmo
RQKk

7. Heart Diseases
• Coronary Artery Disease – Problem with blood
vessels.
• Congestive Heart Failure- Pumping not at normal
levels.
• Bad Heart Rhythms – related to electrical activity.

9. Symptoms of Heart Disease
• Pain in the chest--the heart muscle is not getting
enough flow to keep it going.
• Trouble breathing--blood may back up into the lungs.
• Palpitations (a feeling that the heart is beating too fast,
too hard, or not regular).
• Swelling of feet or legs--blood is backing up from in the
lower body.
• Feeling weak because the body and brain are not
getting enough blood to supply them with oxygen.
• Cyanosis (skin turning a blue colour) means that too
little oxygen is in the bloodstream to supply the cells in
the body.

11. Causes
• High blood pressure
• High Blood cholesterol
• Diabetes
• Obesity
• Smoking
• Heredity
• Stress

12. 5 medication-free strategies to help prevent heart disease
• 1. Don't smoke or use tobacco

13. • 2. Exercise for 30 minutes on most days of
the week.

14. • 3. Eat a heart-healthy diet.

15. • 4. Maintain a healthy weight.

16. • 5. Get regular health screenings.
Blood Pressure
Cholesterol Levels
Diabetes Screening

17. THANK YOU
Ms.B.Aditi
Facilitator – Biology
Campus Genius Academy
T.Nagar
Chennai-17