1. The Circulatory System
Video Introduction
(22min)

2. The Body’s Transport System
Made up of the heart, blood and a series of blood vessels.
Functions:
Delivers nutrients and oxygen to the body cells.
Carries carbon dioxide and other wastes away from the body cells.
Protects the body from disease and infection.

3. The Heart Cardiac muscle Approximately the size of your fist.
Involuntary like smooth muscle
Reacts quickly & Striated like skeletal muscle
Doesn’t tire
Only rests between beats
Approximately the size of your fist.
Located slightly to the left of your sternum.
Pumps approximately 5 L of blood per minute.
Heartbeat is controlled by a special tissue – pacemaker.
Sends out signals to the heart muscle that controls contractions.

4. The Heart Aorta Superior Vena Cava Pulmonary Artery Pacemaker
Vein
Pulmonary
Vein
Left Atrium
Right Atrium
Valves
Valves
Right Ventricle
Left Ventricle
Inferior
Vena Cava
Septum

5. The Heart Your heart is made up of four chambers:
Two upper chambers – Atrium (Atria = singular)
Two lower chambers - Ventricles
The heart is also split into left and right sides
separated by a thick wall of tissue – Septum
Blood will never cross between the two sides.

6. Divisions & Chambers Right Side Left Side Upper Chambers – Atrium
Lower Chambers –
Ventricles

7. Two Loop Pathway
The flow of blood, through the heart, takes place in a two loop pathway
Heart-Lung-Heart
Returning from the body
Low in Oxygen
High in Carbon Dioxide
Heart-Body-Heart
Returning from the lungs
High in Oxygen
Low in Carbon Dioxide

8. Flow of Blood Blood leaving the heart -to the head. Blood returning to
heart-lung-heart
loop
Blood returning to
the heart from the
head.
heart-body-heart
loop
Blood going to
the lungs
Blood going to
the lungs
Blood going back
to the heart from
the lungs
Blood going back
to the heart from
the lungs
Blood leaving
the heart -to
the body.
Blood returning to
the heart from the
body.

9. Myths about the Color of Blood
Is blood really blue?
NO – blood is NOT blue!!!!!! BLOOD IS RED!!!!!
Blood can either be:
high in oxygen, brighter red color, or
low in oxygen, darker red color. (purple)
The skin changes the way blood looks in the veins to make it look bluer in color.

10. Right Side The Patient’s Right Side of the Heart
heart-lung-heart
loop
The Patient’s Right Side of the Heart
Blood is returning to the heart from it’s trip around the body.
Returns to the heart through the Vena Cava
Condition of the blood:
High in Carbon Dioxide
Low in Oxygen

11. 1. 2. Right Side Right Atrium (RA) Right Ventricle (RV)
Function: Collecting chamber
Coming from: body
Going to: Right Ventricle
Oxygen: Low
Carbon Dioxide: High
Right Ventricle (RV)
Function: Pumping chamber
Coming from: Right Atrium
Going to: Lungs
A valve separates the two chambers and prevents blood from flowing backwards. 1. 2.

12. A Trip to the Lungs = (Pulmonary)
Blood leaves the heart, heading to the lungs, through the pulmonary arteries.
Drops off waste gas carbon dioxide.
Picks up new supply of oxygen.
4. Returns to the heart through the pulmonary veins. 3. 3. 4. 4.

13. Left Side The Patient’s Left Side of the Heart
heart-body-heart
loop
The Patient’s Left Side of the Heart
Blood is returning to the heart from it’s trip to the lungs.
Condition of the blood:
High in Oxygen
Low in Carbon Dioxide

14. 5. 6. Left Side Left Atrium (LA) Left Ventricle (LV)
Function: Collecting chamber
Coming from: lungs
Going to: Left Ventricle
Oxygen: High
Carbon Dioxide: Low
Left Ventricle (LV)
Function: Pumping chamber
Coming from: Left Atrium
Going to: Body
Strongest chamber of the heart: Six times more powerful than the right ventricle. 5. 6.

15. Pump Your Blood – Happy Days
Leaving the Heart
To the Head/Upper Body
Blood leaves the heart through the largest and strongest blood vessel in the body – Aorta 7.
Pump Your Blood – Happy Days
(4:09 min)
To the Lower Body