What is the circulatory system? I will know that the circulatory system moves blood through the body.

Cells and organs

Cells and organs Basic unit of structure and function Group of same cells working together Group of different tissues that make one structure Many structures working as a whole

Circulatory System Heart, Blood, and Blood Cells Arteries Capillary Away from the heart Capillary smallest blood vessels Veins Into the heart Valves Flaps that keep blood moving in the right direction

Review Questions What is the job of the circulatory system? It moves blood through the body. Which blood vessels carry blood away from the heart? Arteries What might happen if the valves in a person’s veins fail to close properly? Oxygen-poor blood might flow away from the heart.

Questions How would you describe an artery’s walls? They are thick and muscular. Write the following circulatory system structures in order of thickest walls to thinnest walls; capillaries, veins, arteries. Arteries Veins Capillaries

Four Chambers in your heart

Parts of the Heart The heart is a pump Has 4 chambers 1) Right Atrium 2) Right Ventricle 3) Left Atrium 4) Left Ventricle Blood leaves heart through the Aorta Body’s largest artery

Extra Resources http://kidshealth.org/en/kids/heart.html https://www.youtube.com/watch?v=-s5iCoCaofc