1. HEART NOTES

2. Heart The heart is a muscular organ (cardiac tissue).
It is the size of your fist.
Thick muscular walls

3. Chambers of the Heart
Upper chamber- atrium receives blood coming in from the veins (do not pump blood).
Lower chamber- ventricle squeezes blood out into the arteries (pump).
There are valves in the heart that close to prevent backflow.

4. Function Function is circulation
Blood moves due to increased pressure within the heart.

5. Blood Flow
Oxygen poor blood Lungs Oxygen rich blood to the body Oxygen poor blood Veins Heart Arteries Arteries=Away Veins=To the heart

6. Exit Slip
What are the 4 chambers of the heart? Which chambers are responsible for pumping the blood?