here is your heart let’s find out! how does it work?
TRANSCRIPT
Here Is Your Heart
Let’s Find Out!
How Does It Work?
Amazing Facts!
• The heart beats an average of 3 billion times during your life.
• About 8 million blood cells die every second.
• It takes 20 sec. for a red blood cell to circulate the whole body.
• The heart pumps about 1 million barrels of blood during the average lifetime.
The Heart• The Heart Is A Muscle
• Divided Into Left And Right Halves
• It Pumps The Blood
• 5 Liters Per Minute When You Are At Rest
Where Does The Blood Go?
• To The Head
• To The Limbs
• To The Internal Organs
• To The Skin
• To The Heart Itself
• Everywhere!
Through Arteries
• Carry Blood Away From The Heart
• Muscular Walls
• Maintain Blood Pressure
• Oxygen Rich Blood
To The Capillaries• One Cell –Layer
Thickness• Site Of Gas
Exchange• Cells Pass Single
File• Help Control Body
Temperature
To The Veins
• Carry Blood Back To The Heart
• Less Muscular
• Low Pressure
• Oxygen-Poor Blood
• Contain Valves
And Back To The Heart
During Your Lifetime
• Your Heart Will Beat Some 2.5 Billion Times
• Pump Enough Blood To Fill About 2000 Swimming Pools
• And Never Stops To Rest
How Does It Do It?
The Heart Has 4 Chambers
Right Atrium
Left Ventricle
Left Atrium
Right Ventricle
Let’s Follow The Flow
1. Body To Right Atrium
2. To Rt. Ventricle
3. To The Lungs
4. From The Lungs To The Lt. Atrium
5. To Lt. Ventricle
6. Out To The Body
The Right Side…
• Oxygen-Poor Blood Enters The Heart At The Right Atrium
• Passes Through The Tricuspid Valve
• Enters The Right Ventricle
• Passes Out Through The Pulmonary Artery
RA
RV
PA
To The Lungs Where…
1. Waste Carbon Dioxide Is Removed
2. Needed Oxygen Is Gained
3. Exits Through The Pulmonary Veins To…
…The Left Side• Oxygen-Rich Blood
Enters The Left Atrium• Passes Through The
Bicuspid (Mitral)Valve• To The Left Ventricle• Out The Aorta To The
Body
LA
LV
Let’s Watch It Happen
Very Cool!
The Heart Is Controlled By Electrical Signals
Pacemakers
• Coordinate Contraction
• SA Node Initiates
• AV Node Continues
• Conduction Pathways Finish
Artificial Pacemakers
Control Pace When The Heart Can’t
Coronary Circulation• Begins In Aorta• Supplies The Heart
Muscle With Blood• Shown Here In An
Arteriogram• Narrowing Can Cause
Pain (Angina)• Blockage Results In A
Heart Attack (M.I.)
Narrowing Can Occur In Other Arteries Too
We Can Check The Heart With An Echocardiogram
• Sound Is Used
• Shows The Chambers
• Shows The Valves
• Shows Blood Flow In Color
• It’s Painless
To Be Heart HealthyExercise Regularly
Eat Heart-Healthy Meals
Reduce Stress
Don’t Smoke
Get Plenty Of Rest
OTHER ANIMALS MAY CIRCULATE BLOOD
DIFFERENTLY THAN IN MAMMALS
PART - 2
Do Worms Have Hearts?
• Worms have a closed circulatory system. Their blood travels through vessels.
• Worms have 5 “heart arches” that move blood through vessels.
• The top vessel carries blood forward.
• The bottom vessel moves blood rearward.
• Worms don’t have red blood cells.
WORM CIRCULATION
INSECT CIRCULATION
• Insects have an open circulatory system.
• Blood doesn’t flow through vessels
• Blood doesn’t carry oxygen and isn’t red.
• Insects don’t need much oxygen.
Other Heart Arrangements