There are also three kinds of structures found in plant cells and not in animal cells. 1  cells have. ; 2  animal cells do not. 3  As noted in the description of the prokaryotic cell wall, the cell must also have a plasma membrane. 4  Plant cells have cell walls in addition to plasma membranes, not instead of plasma membranes. The. 2  for a eukaryotic cell is the same kind of structure, and has the same function as the plasma membrane of a prokaryotic cell. ( 3 ER) is a system of membrane-enclosed channels which ramifies throughout the cytoplasm of the cell. 4  It comes in two types--smooth and rough.
Â· just now. Report Abuse. Donated blood lasts for around 35 days as whole blood collected into a bag with anticoagulant and additives which help keep the blood cells alive (dextrose, phosphate and citrate). Plasma that is separated off can be frozen (at minimum -25 degrees Celcius) and kept for one year.
Erythrocytes last about 120 days in bloodstream--removed by macrophages in spleen, liver and marrow (about 1% per day) (lose about 173 million per minute). RBC is about 5 billion per milliliter. The production-destruction balance so that the adult maintains about 5 liters of blood.