Set of 8 related 35mm images as photographed through a microscope. Arrows & callouts help students locate important features being studied. Include human blood, white blood cell, artery & vein, capillaries in lung, rat heart, valve of aorta & sickle cells. Accompanied by a detailed lesson plan designed to stimulate, inform & question students on the topic. Used with Microslide Viewer. Great for kids age 5 & above.