1. Circulatory System
Watch the Brain POP: Circulatory System or Crash Course
(circulatory system starts 5 min in)

2. Function
Transport substances (nutrients, oxygen, disease fighting materials) throughout body
Also disperses heat to maintain body temperature

3. Parts of the System Heart Blood Blood vessels
Lymphatic system (immune response)

4. Heart
Watch the Brain POP: Heart
Label your heart diagram

7. Label your heart diagram
Use the website: heart Determine the correct order of the path of blood and highlight your heart diagram to show blood flow. Use 2 colors to represent oxygenated and deoxygenated blood.

8. Blood Vessels

9. Blood Vessels
Types:
Arteries-carry oxygen rich blood from heart to body, thick and durable-high pressure from heart
(aorta is the largest artery)
Capillaries-microscopic blood vessels, thinner-allows for substance exchange-can change size if higher blood flow needed
Veins- largest vessels, carry oxygen poor blood back to heart, not thick like arteries

10. Factors that affect blood flow Watch Brain POP: Blood Pressure
Blood pressure-if pressure is too low, blood won’t flow-tissues die. If too high-vessel stiffen and capillaries can rupture
Blood volume
Resistance-friction between blood and wall of blood vessel, if resistance increases, blood flow decreases. Viscosity of blood also affects blood flow-viscosity is the resistance to flow, so high viscosity = less blood flow
Activity level