Here Is Your Heart

1
Here Is Your Heart
How Does It Work?
Lets Find Out!
2
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.

3
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

4
Where Does The Blood Go?

• To The Head
• To The Limbs
• To The Internal Organs
• To The Skin
• To The Heart Itself
• Everywhere!

5
Through Arteries

• Carry Blood Away From The Heart
• Muscular Walls
• Maintain Blood Pressure
• Oxygen Rich Blood

6
To The Capillaries

• One Cell Layer Thickness
• Site Of Gas Exchange
• Cells Pass Single File
• Help Control Body Temperature

7
To The Veins

• Carry Blood Back To The Heart
• Less Muscular
• Low Pressure
• Oxygen-Poor Blood
• Contain Valves

8
And Back To The Heart
9
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?
10
The Heart Has 4 Chambers
Right Atrium
Left Atrium
Left Ventricle
Right Ventricle
11
Lets 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

12
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

PA
RA
RV
13
To The Lungs Where

1. Waste Carbon Dioxide Is Removed
2. Needed Oxygen Is Gained
3. Exits Through The Pulmonary Veins To

14
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
15
Lets Watch It Happen
Very Cool!
16
The Heart Is Controlled By Electrical Signals
17
Pacemakers

• Coordinate Contraction
• SA Node Initiates
• AV Node Continues
• Conduction Pathways Finish

18
Artificial Pacemakers
Control Pace When The Heart Cant
19
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.)

20
Narrowing Can Occur In Other Arteries Too
21
We Can Check The Heart With An Echocardiogram

• Sound Is Used
• Shows The Chambers
• Shows The Valves
• Shows Blood Flow In Color
• Its Painless

22
To Be Heart Healthy

• Exercise Regularly
• Eat Heart-Healthy Meals
• Reduce Stress
• Dont Smoke
• Get Plenty Of Rest

23
OTHER ANIMALS MAY CIRCULATE BLOOD DIFFERENTLY
THAN IN MAMMALS
PART - 2
24
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 dont have red blood cells.

25
WORM CIRCULATION
26
INSECT CIRCULATION

• Insects have an open circulatory system.
• Blood doesnt flow through vessels
• Blood doesnt carry oxygen and isnt red.
• Insects dont need much oxygen.

27
Other Heart Arrangements
28
(No Transcript)