1. Circulatory System
7th Grade Science
2013

2. Objective
SWBAT identify the components of blood and relate them to their functions.

3. Today is not for the weak of heart…
The circulatory system is composed of the heart and blood vessels.
Heart = Key organ of the circulatory system

4. Function of the Circulatory System
Carries material and nutrients around our bodies.
Blood goes from the heart, around the body and back again.

5. Blood: Definition and Function
Blood: connective tissue that flows through blood vessels
Carries oxygen, nutrients , and carbon dioxide to cells throughout your body.

6. Plasma
Clear mixture of water, minerals, nutrients, proteins, other substances
Fluid part of blood that carries other cells

7. Red Blood Cells (RBCs) Carry oxygen to all cells in your body
Most common type of blood cell
Contain hemoglobin, which clings to oxygen molecules
Red blood cells are why blood looks red

8. White Blood Cells (WBCs)
Destroy pathogens (bacteria, viruses, etc. that make you sick) by hunting them or using antibodies
Destroy dead or damaged body cells.
Fight off disease and keep you healthy.

9. Platelets Produced in bone marrow
Main function: Clump together to force blood to clot; to stop bleeding
20% of the diameter of red blood cells

10. Check For Understanding