1. CARDIOVASCULAR SYSTEM

2. Heart Facts
Hold out your hand and make a fist. If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists.
Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.
Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard--twice as hard as the leg muscles of a person sprinting.

3. 3 Major Parts of the Circulatory system
Blood Vessels - routes blood travels
Heart – pumps or pushes blood through body
Blood – carries important “ *stuff ” through body
* Stuff – includes oxygen, food, & waste

4. CIRCULATORY SYSTEM
CONTAINS
HEART
BLOOD VESSELS
BLOOD

5. Circulation
Your body resembles a large roadmap, There are routes or “arteries” that take you downtown to the “heart” of the city.

6. # 1 Blood Vessels : One Way Streets
Blood Vessels resemble very long and skinny tunnels that are all through your body.

7. 3 Types of Blood Vessels Arteries Capillaries Veins
* Click on each blood vessel to explore its function in circulation

8. HEART=PUMP

9. Heart is made up of 3 layers
Endocardium-smooth layer of cells that line the inside of the heart.
Myocardium- middle and thickest layer of muscle
Pericardium- sac that covers the outside of the heart

10. #2 The Heart 4 chambers ( or compartments )
2 upper chambers : Left Atrium Right Atrium
2 lower chambers : Left Ventricle
Right Ventricle

12. ONE WAY VALVES
Heart has several one way valves that allow blood to flow in one direction
Tricuspid
Pulmonary
Mitral
Aortic

13. Cycle
Each cycle or beat consists of a rest (or filling )period called DIASTOLE
Followed by a ventricular contraction called SYSTOLE

14. What starts a beat?
A group of nerve cells in the atrium called the SA NODE sends out an electrical impulse which triggers the heart into action.
This node is often referred to as the PACEMAKER of the heart
This impulse continues into the ventricles and helps it to contract. This happens every 0.8 seconds

15. ELECTRICAL PATHWAY

16. If you listen to your heartbeat, it makes a lub dub sound.
The lub is when blood is pushed out of the heart into the body and the dub is the reloading of the heart with more blood ready to push it out to the body

17. Blood Flow through the Human Body
Blood with little oxygen is pumped from the Right Atrium through a valve to the Right Ventricle and through another valve into the Pulmonary Vein. The Pulmonary Vein sends it to the Lungs to pick up Oxygen. It’s sent from the Lungs through Pulmonary Arteries to the Left Atrium through a valve to the Left Ventricle. The Left Ventricle sends it through a valve to the Aorta. The Aorta is a series of branches that sends oxygenated blood throughout the body.

18. Heart Rate can be determined using a Stethoscope

19. BLOOD Often called a tissue because it contains many types of cells
4-6 quarts of blood in the average adult.
Made up of PLASMA , which is 90% water and BLOOD CELLS

20. Your Blood is made of Plasma Red Blood Cells Liquid part of blood
They carry oxygen to all parts of the body

21. White Blood Cells
Fight and kill germs that may enter your bloodstream

22. Platelets
Form “scabs” when you cut yourself
Helps stop the bleeding

23. Blood Types There are 4 main Blood Types:
Type A, Type B, Type AB, and Type O
Dr. Charles Drew * click on link for history of the Blood Bank

24. The chamber in the heart that receives deoxygenated blood as it returns from body cells is
iRespond Question
Multiple Choice F
E B-9B4C-A079-3C57B4F66C90
A.) RT atrium
B.) RT Ventricle
C.) LT atrium
D.) LT Ventricle
E.)

25. The chamber of the heart that receives oxygenated blood as it returns from the lungs the
iRespond Question
Multiple Choice F
CBF83079-B51C-D848-B8DB-8BE2CEA956F4
A.) Rt Atrium
B.) LT Atrium
C.) Rt Ventricle
D.) Lt Ventricle
E.)

26. Back into the right atrium is
The valve between the right atrium & the right ventricle that prevents blood from flowing
Back into the right atrium is
iRespond Question
Multiple Choice F
6C0D8094-B4AA-F64B-9344-F20F5AFBD322
A.) Tricuspid Valve
B.) Pulmonary Valve
C.) Aortic Valve
D.) Mitral Valve
E.)

27. The blood vessels that carry blood towards the heart are
iRespond Question
Multiple Choice F
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A.) Arteries
B.) Veins
C.) Venules
D.) Capillaries
E.)

28. The blood vessels that contain valves to prevent blood from flowing in a backward direction
iRespond Question
Multiple Choice F
B A-B253-9DA9CC4A2E1C
A.) Arteries
B.) Veins
C.) Capillaries
D.) Arterioles
E.)

29. The largest artery in the body is
iRespond Question
Multiple Choice F
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A.) Carotid
B.) Femoral
C.) Aorta
D.) Coronary
E.)

30. The thickest layer of heart muscle is.
The thickest layer of heart muscle is
iRespond Question
Multiple Choice F
1E09E025-55BD-A043-A39C-828DBCAB845E
A.) Septum
B.) Endocardium
C.) Myocardium
D.) Pericardium
E.)

31. The muscular wall that separates the heart into left & right sides is
iRespond Question
Multiple Choice F
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A.) Septum
B.) Endocardium
C.) Myocardium
D.) Pericardium
E.)

32. The valve between the left atrium & left ventricle that prevents blood from flowing back to the left atrium is
iRespond Question
Multiple Choice F
E95E031E-83BF-7445-A95D-7D1DC6FD86BF
A.) Tricuspid
B.) Pulmonary
C.) Aortic
D.) Mitral
E.)

33. The blood vessels that carry blood away from heart are
iRespond Question
Multiple Choice F
2C A23E D8-BA9B41D69B8F
A.) Arteries
B.) Veins
C.) Venules
D.) Capillaries
E.)