Dialysis blocks the passage of larger substances (for example, red blood cells, large proteins). This replicates the filtering process that takes place in the kidneys when the blood enters the kidneys and the larger substances are separated from the smaller ones in the glomerulus. The two main types of dialysis, hemodialysis and peritoneal dialysis, remove wastes and excess water from the blood in different ways. Hemodialysis removes wastes and water by circulating blood outside the body through an external filter, called a dialyzer, that contains a semipermeable membrane. The blood flows in one direction and the dialysate flows in the opposite.
Organ gifting blood, tissue, semen, and cell line donations. The concept of gift is widely used in policies (such as the Uniform Anatomical Gift Act) regarding organ transplantation and the use of cadavers for medical studies. Researchers from various disciplines have analyzed and critiqued the idea of organ gifting and this belief that gifting and organ commodification are mutually exclusive. For instance, Waldby and Mitchell, in their book "Tissue Economies: Blood, Organs, and Cell Lines in Late Capitalism", have indicated that "we hope to complicate and disorganize the gift-commodity dichotomy, because we consider it an inadequate way to conceptualize the political economy