A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this by using at least two races to contain the balls and transmit the loads through the balls.
1 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. , which is quite different from the peptidoglycan of prokaryotic cell walls. 2  The primary function of the cell wall is support, and inconjunction with the central vacuole, to create turgor (stiffness) in plant structures like leaves. 3  Plant cells contain a specialized vacuole called the. .
Organelles are the living bodies inside the cells. These are mainly the characteristics of a eukaryotic cell. These show the division of labour at cellular level and carry out all the activities inside a cell. The physiology of a cell can be attributed to the collective functions of these organelles. Each organelle has it's specific function(s). Besides these, the microtubules and microfilaments are also present which provide support to the cell and may be involved in motility.