1. Circulatory System
"The Heart"

2. Fun facts: You have 96 000km of blood vessels
You have 100 trillion cells that need transport
Your heart is about the size of your fist and has a mass of about 300g
Heart beats about 70 times/minute
Every minute 5L of blood cycles through the heart and lungs
Your circulatory system is closed.
Your blood is your immune system!!

3. Review: How blood is transported
Arteries:
Vessels that carry blood away from the heart
Tough but elastic. Able to withstand the pressure of blood pumped by the heart
Veins:
Thinner walls as there is no more blood pressure
Have “one way” valves to keep blood moving towards heart.
Capillaries:
Very narrow tubes between arteries and veins where diffusion occurs

5. Characteristics
It connects all parts of an organism in a way that allows individual cells to thrive as well as for organisms to function as a unit
It is an entirely closed system

6. Functions:

7. Major Components 1. Pump (heart) 2. Network of tubes 3. Blood
Continuously circulates blood
2. Network of tubes
Arteries- blood away from heart
Veins- blood back to the heart
3. Blood
Fluid that fills the circulatory system

8. Accessory Organs
Lungs - organ where oxygen is taken up and CO2 is released
Kidneys - organ where wastes are removed from blood; critical in regulating fluids in the body
Small intestine - digestion
Large intestine - water absorption

9. The Heart
The human heart is a two-sided, 4 chambered structure with muscular walls.
The four chambers are:
Left ventricle
Right ventricle
Left atrium
Right atrium

10. The Heart: Parts

11. Pulmonary veins
aorta
Pulmonary artery
vena cava
Tricuspid valve
aortic valve
pulmonary valve
Mitral valve
Right atrium
left atrium
Right ventricle
Left ventricle

12. What do valves do? The valves are one directional
They keep blood moving in the right direction.