1. 2.02 Understand the functions and disorders of the circulatory system
What are the functions of the heart?
2.02 Understand the functions and disorders of the circulatory system 1

2. 2.02 Understand the functions and disorders of the circulatory system
Functions of the heart
Did you know?
At rest, 2 ounces of blood
is circulated with each heart beat.
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3. Functions of the heart It’s a PUMP
The heart pumps blood around the body, it is a double pump.
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4. 2.02 Understand the functions and disorders of the circulatory system
Hear the beat!
What makes the Lubb Dubb sound?
Lubb - is the cuspid valves closing
Dubb is the semilunar valves closing
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5. 2.02 Understand the functions and disorders of the circulatory system
Blood Pressure FYI
Blood pressure is the surge of blood when heart pumps creates pressure against the walls of the arteries
SYSTOLIC PRESSURE
Measured during the contraction phase
DIASTOLIC PRESSURE
Measured when the ventricles are relaxed
What is the normal range of
blood pressure for an adult? 120/80
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6. Functions of the heart It’s a PUMP
What makes the pump work?
It’s electric!
The electrical activity of the heart occurs from SA and AV nodes.
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7. Functions of the heart
Sinoatrial (SA) node or pacemaker starts the shock and contracts the atriums
The electric shock continues to the Atriventricular (AV) node
Shock continues down the Bundle of HIS
right and left bundle
Then through fine fibers called
Purkinje Fibers that contract the ventricles 7

8. 2.02 Understand the functions and disorders of the circulatory system
It’s electric!
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9. 2.02 Understand the functions and disorders of the circulatory system
Electrocardiogram
EKG or ECG
SYSTOLE = contraction phase
DIASTOLE = relaxation phase
Baseline of an EKG is a flat line:
P = Atrial contraction
QRS = Ventricular contraction
T = Ventricular relaxation
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10. Functions of the heart Transportation
Three key questions to be answered in next part of notes!
What does the heart transport?
What is involved in the transportation process?
How is this a circulatory system function?
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11. 2.02 Understand the functions and disorders of the circulatory system
The transportation process
Systemic circulation -
circulation to the system!
Cardiopulmonary circulation-
Circulation the heart & lungs
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12. The transportation process
Right side
Superior vena cava
Inferior vena cava
Right atrium
Tricuspid valve
Right Ventricle
Pulmonary valve
Pulmonary artery
Lungs CO2 and O2 exchange
Left Side
Pulmonary vein
Left atrium
Bicuspid valve
Left ventricle
Aortic valve
Aorta
Body
(Schematic of cardiopulmonary circulation)
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13. The transportation process
Cardiopulmonary circulation: goes to lungs to get O2
Systemic Circulation goes to body to deliver O2
Compare
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