1. Ms. Campanicki Allied Health
Circulatory System
Ms. Campanicki
Allied Health

2. Lesson Essential Question
What parts of the heart control blood flow?
Why does blood only flow in one direction?
Why does the heart need a continous supply of oxygen?

3. Circulatory System Body's delivery system
Completes the process of circulation by pumping oxygenated blood through the body and retuning deoxygenated blood back to the lungs.
Parts
Heart
Blood vessels
Veins
Lungs

4. The Heart: PUMP Weighs about 350g ( 12.35 oz. = a can of COKE )
Adult heart is the size of a closed fist
Pumps over 8000 liters of blood per day
The heart will beat:
100,000 times/day
35 million times/ year
2.5 billion times/ lifetime

5. Heart Location The heart lies 2/3's on the left side of the body
Mediastinum
extends from the sternum anteriorly to the vertebral column and lies medially between both lungs

7. The Pericardium What does Pericardium mean? Peri = Cardium =
Protective sac that covers the heart
contains fluid that allows for free movement of the heart with each beat

8. Anatomy of the Heart : Muscle
Microscopic View
Shape
Branching chains
Striated
Uninucleated
Intercalated discs
Location
In the heart only
Regulation of contraction
Involuntary
Contraction style
Speed: slow
Rhythmic

10. Anatomy of the Heart: Heart Wall
Composed of 3 layers
From superficial to deep :
Epicardium: thin, transparent, comes in contact with the pericardium and pericardial fluid
Myocardium: thick middle layer made of muscle (cardiac muscle)
Endocardium: thin layer that comes in contact with blood during each contraction, is the anchor for valves of the heart

12. Anatomy of the Heart: Chambers
Divided into right and left
4 chambers total
Upper Chambers = Atria (atrium)
Lower Chambers = Ventricles ( ventricle)
They are divided by a septum (thick myocardium)

13. Anatomy of the Heart: Chambers
Atriums: Thin muscular walls that are highly expandable.
Ventricles: Thicker walls used to push the blood to the lungs or the whole body. Left side thicker than right.
Right vs. Left Ventricle
Right does not work as hard and walls are not very thick
Left walls are much thicker to pump blood to the entire body and will generate 6x the pressure of the right.

14. Anatomy of the Heart : Valves
Help to control blood flow to and from the heart
Found between each atrium and ventricle
Found in each vessel leading into and out of the heart
Bicuspid Valve : two cusps (flaps) between the Left atrium and ventricle (MITRAL)
Tricuspid Valve: three cusps (flaps) between the Right atrium and ventricle
Pulmonary Valve : Leads to the pulmonary arteries
Aortic Valve: leads to the aorta

15. How does blood circulate through the whole body?
Heart House Time

17. Circulatory System Diseases and Disorders