1. Circulatory System & the Heart

2. Circulatory System Functions
Transports blood and other materials
Pick up:
Waste (CO2, urea, etc.) from body cells/tissues
Delivered to lungs or kidneys to excreted
Drop off:
Nutrients to body cells/tissues
O2 to body cells/tissues
Maintains body temperature by distributing heat that is produced by cells
Activity makes muscles/organs produce more heat, the heart pumps harder & blood vessels dilate to bring excess heat to the skin

3. Closed system Humans have a “closed system”
All blood is enclosed in vessels
Includes: Heart, blood vessels, and blood
System is interconnected to other systems
Respiratory system

4. Heart Large muscle located in middle/left chest
Surrounded by pericardium (thin layer of tissue)

5. Divided into 2 sides…left & right
Separated by a thick wall called septum
Right side receives deoxygenated blood from body and pumps it to the lungs
Left side receives oxygenated) from the lungs and pumps out to the body

6. Each side is divided into top and bottom sections
Top sections are called atriums, receive blood
Right atrium receives deoxygenated blood from body
Left atrium receives oxygenated blood from lungs
Bottom sections are called ventricles, pumping chambers
Right ventricle pumps deoxygenated blood to lungs
Left ventricle pumps oxygenated blood to body

7. Heart diagram
Right
Atrium
Left
Atrium
Right
Ventricle
Left
Ventricle

8. Do Now Questions:
Which chambers of the heart carry deoxygenated blood?
Where does the right atrium get its blood from?
Where does the left atrium get its blood from?
Where does the right ventricle send its blood?

9. How does the blood get from section to section?
Sections are separated by A/V valves
Between atrium and ventricle
Tricuspid valve is between the R. atrium & R. ventricle
Bicuspid valve is between the L. atrium & L. ventricle

10. Left Atrium
Bicuspid Valve
Right Atrium
Left Ventricle
Tricuspid Valve
Right Ventricle
Septum

11. Blood Vessels Attached to the Heart:
Aorta (a)
Vena Cava (v)
Pulmonary Artery (a)
Pulmonary vein (v)