1. HUMAN TRANSPORT
SYSTEM

2. Parts of the Circulatory System
Blood
Heart
Blood vessels

3. BLOOD Is a liquid tissue (organelles, cell, tissue, organ)
Your body contains 3 to 5 liters of blood
2 PARTS
LIQUID – PLASMA- 90% water,also contains dissolved proteins,salts,sugar,vitamins,food, and wastes
SOLID - cells

4. BLOOD FUNCTIONS OF BLOOD:
Carries materials to the cells (nutrients, oxygen, hormones etc)
Carries wastes away from the cells (carbon dioxide, nitrogenous wastes etc)
Helps regulate body temperature
Helps to protect against infections

5. Components of Blood RED BLOOD CELLS Are disc shaped and biconcave
Contain hemoglobin (an iron containing protein) which carries oxygen and gives blood it’s red color
Are produced in the bone marrow
Lack a nucleus

6. Blood Components White Blood Cells
Have a nucleus
Protect the body from disease
Produced in bone marrow, lymph nodes,spleen
pus= many white blood cells at the site of an infection

7. Types of White Blood Cells

8. PLATELETS Small cell fragments Do not have a nucleus
Help with the formation of blood clots
(blood clotting is a series of enzyme controlled reactions)
Heparin- substance produced by the liver that prevents blood from clotting in the blood vessels

9. BLOOD CELLS
Can you identify the types of cells?

10. BLOOD VESSELS Arteries: Carry blood away from the heart
Most carry oxygenated blood
The walls are thick and elastic
Smallest arteries are called arterioles
Largest artery is the aorta

11. BLOOD VESSELS Veins Carry blood back to the heart
Most carry deoxygenated blood
Walls are thin and only slightly elastic
Have valves to prevent the backflow of blood
Smallest veins are called venules
Largest veins are the inferior and superior vena cavas

12. BLOOD VESSELS
Veins

13. BLOOD VESSELS Capillaries Connect arterioles to venules
Exchange of materials between blood and cells takes place here (oxygen, nutrients, wastes)
Are 1 cell layer thick (RBC’S pass 1 at a time)

14. Next notes on circulation pathways

15. Lymph
When blood plasma diffuses through the walls of the capillaries and surrounds the cells it is called intracellular fluid or ICF, which helps move materials between the blood and cells.
When ICF diffuses into lymph vessels it is called lymph