powerpoint file on the circulatory systems

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

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
 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. 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
► http://videos.howstuffworks.com/hsw/5950-blood-
the-components-of-blood-video.htm
► http://videos.howstuffworks.com/hsw/25405-
human-body-blood-video.htm
► http://health.howstuffworks.com/blood2.htm
► http://health.howstuffworks.com/blood3.htm
► http://health.howstuffworks.com/blood4.htm
► http://health.howstuffworks.com/blood5.htm