1. The Circulatory System

2. The Circulatory System

3. Functions of the Circulatory System
Transports nutrients and oxygen to body cells
Transports waste products away from body cells
Fights infection

4. Blood Flow through the BODY
HEART  LUNGS  HEART  CELLS   

5. STRUCTURE of the Circulatory System
HEART (pump)
BLOOD (fluid)
BLOOD VESSELS (pipes)

6. HEART pump composed of cardiac muscle tissue
Contains four chambers that separate O2-rich blood from O2-poor blood
(left atrium, right atrium, left ventricle, right ventricle)

7. The Heart

8. The Heart

9. Blood Plasma Red Blood Cells White Blood Cells Platelets
Liquid portion of the blood
92% H2O
Makes up 54.3% of blood volume
Red Blood Cells
Contain hemoglobin; Carry O2
Produced in bone marrow
Live about 4 months
No nuclei; 45% of blood vol.
White Blood Cells
Immune system cells
Help fight infection and disease
Move from blood to tissues–form pus
Produced in bone marrow
Help repair injured blood vessels
Produce clots (scabs); stop bleeding
Platelets

10. Blood

14. Blood is RED. Oxygen-rich blood is bright red.
Oxygen-poor blood is dark red.

15. FACTOIDS:
A tiny drop of blood contains approx.
5 million RBCs.
It takes about 20 seconds for one RBC
to circle the whole body.
Your heart will beat about 3 billion times
during your lifetime.

16. BLOOD VESSELS Arteries Veins Capillaries
Carry blood away from the heart
Contain thick walls (smooth muscle)
Found deep within the body
Veins
Carry blood back to heart
Contain thin walls (smooth muscle)
Valves prevent backward flow of blood
Located near surface of the body
Capillaries
Tiny vessels which join arteries to veins
Site of gas exchange (CO2 and O2) in the lungs
Site of nutrient and waste exchange at cells
Microscopic, thin-walled

17. The Heart

18. Blood Circulation

19. Blood Circulation

20. Blood Flow through the Heart
Blood comes into the heart via the superior and inferior vena cava
Blood enters the right atrium; goes through a valve to the right ventricle
Blood leaves the right ventricle through the pulmonary artery (away from heart)
Blood goes to the lungs to pick up oxygen
Blood comes back to the heart through the pulmonary vein (to the heart)
Blood goes into the left atrium; goes through a valve into the left ventricle
Blood leaves the heart for the rest of the body through the aorta

21. Normal blood pressure is 120/80
Terms to Know
Pulse – throbbing of arteries due to heart contractions
Blood Pressure – pressure in arteries when ventricles contract (systolic number – top #)
pressure in arteries when ventricles relax (diastolic number – bottom #)
Normal blood pressure is 120/80

22. MALFUNCTIONS Disease Problem Effect on Body Atherosclerosis
Fatty material (cholesterol) builds up in blood vessels causing them to become more narrow
Causes hypertension (high blood pressure), heart attack
Heart Attack
Arteries become blocked
Some heart tissue dies

26. Troubled Hearts

27. Atherosclerosis

28. Heart after a Heart Attack

29. Heart attack

30. Heart attack

31. Videos