Khan Academy Static

After using your jeans for a while, you’ll begin to notice small tears and rips developing in the fabric. Why doesn’t this happen to your heart as well? Well, your heart manages to stay healthy despite all of the “wall stress” that pulls on the heart walls. During different parts of the heart cycle (afterload vs. preload) the mechanics of “wall stress” change dramatically. Learn exactly what preload and afterload mean, and how we can use pressure-volume loops to estimate their values.

10936_Why_doesn_t_the_heart_rip_.html

10941_Sarcomere_length_tension_relationship.html

10943_What_is_afterload_.html

10944_Increasing_the_heart_s_force_of_contraction.html

10940_Frank_Starling_mechanism.html

10939_Preload_stretches_out_the_heart_cells.html

10938_Preload_and_pressure.html

10937_What_is_preload_.html

10942_Active_contraction_vs_passive_recoil.html