Khan Academy Static

No organ quite symbolizes love like the heart. One reason may be that your heart helps you live, by moving ~5 liters (1.3 gallons) of blood through almost 100,000 kilometers (62,000 miles) of blood vessels every single minute! It has to do this all day, everyday, without ever taking a vacation! Now that is true love. Learn about how the heart works, how blood flows through the heart, where the blood goes after it leaves the heart, and what your heart is doing when it makes the sound “Lub Dub.”

15878_Thermoregulation_in_the_circulatory_system.html

15873_Lub_dub.html

15875_Arteries_vs_veins_what_s_the_difference_.html

15876_Resistance_in_a_tube.html

15871_Flow_through_the_heart.html

15872_Two_circulations_in_the_body.html

15870_Meet_the_heart_.html

15877_Putting_it_all_together_Pressure_flow_and_resistance.html

15874_Layers_of_a_blood_vessel.html