The red blood cell begins life in one of the bone marrows, our heroine begins her life in the femur factory! At first she is a little confused, but soon finds the signs that lead her to the right atrium, just up the veins. From there she makes it to the lungs, where Air Sac senpai gives her some oxygenated packages. Then she goes back to the heart, this time at the left atrium. She’s a little lost, but eventually follows a path to the brain, where she makes a delivery! Before she could go, the local McCapillary gave her a deoxygenated package. After 120 days of life, it’s time for retirement in the spleen.