Methods and apparatus for a bioreactor system for growing cells are provided. The bioreactor system includes a reaction chamber for cultivating harvested tissue in a culture medium, and a hydrodynamic apparatus connected to the reaction chamber that generates a cyclic negative pressure differential in the bioreactor. Additionally, the apparatus includes a collection enclosure for collecting cells produced by tissue in the reaction chamber. Also encompassed are embodiments for harvesting and preparing cells and tissue sections, combining the cells and the tissue sections in a culture medium to cultivate tissue, maintaining the tissue under conditions that permit production of cell products, applying cyclic negative pressure to the culture over a period of time, and collecting cell products discharged. Further disclosed are embodiments for placing harvested tissue and cells in a diffusion chamber, creating an oscillating negative pressure differential in the bioreactor over a period of time, and collecting the cell products.