1. The Circulatory System 3 ESSENTIAL COMPONENTS
BLOOD
Carrier
VESSELS
TRANSPORTS THE BLOOD
HEART
PUMPS THE BLOOD
THROUGH THE BODY

2. Importance of the Circulatory System

3. Components of Blood Average Person Has 5L -0.1% White Blood Cells &
Platelets
-99.9% Red Blood Cells
Average Person Has 5L

4. Components of the Blood
Red Blood Cells (RBC’s)
Also known as Erythrocytes
White Blood Cells (WBC’s)
Also known as leukocytes
Platelets

5. Components of the Blood
Red blood cells:
Biconcave Structure
allows them to fit through small vessels called capillaries
Do not contain a nucleus
Packed with hemoglobin which attracts & binds oxygen
Hemoglobin
increases the oxygen carrying ability of the blood by 70 times (1 RBC=280 Million)

6. Hemoglobin

7. Components of the Blood
White Blood Cells:
Less WBC’s than RBC’s (1:700)
Have a nucleus
Immune system relies on WBC’s to attack viruses, bacteria or other foreign substances that may enter the body
Form antibodies (used for foreign material recognition)-does not attack objects themselves-they alert WBC’s to attack

8. Components of the Blood
Platelets:
Similar to RBC’s, these cells contain a nucleus
Move through blood until they strike any sharp object or torn tissue, then they rupture
Release chemicals that create a mesh of fibres

9. Platelet Importance Red blood cells get caught in fiber mesh
Creation of Blood Clots

10. Bone Marrow
RBCs, WBCs and platelets are all produced in the bone marrow

11. Work Session Read Pages 316-322 in Wesley Biology Text
Work on filling in the Circulatory Work Sheet (Description & Functions)
First 7 relate to todays lecture
If finished, read ahead to complete as much as you can to prep
for next lessons!
Intro to Pulse & Blood Pressure Lab! (if we have time)