Full, upper and lower dentures. A set of full dentures are used when all natural teeth need replacing. Upper dentures replace the top row of teeth and lower dentures replace the lower row of teeth. Partial dentures are used when just one or more of your teeth need replacing. They also help maintain the alignment of your remaining teeth and keep them from shifting. If youâd like to find out more about partials, visit our dedicated partials page.
The chorion is the outermost membrane around the embryo in mammals, birds and reptiles.It develops from an outer fold on the surface of the yolk sac, which lies outside the vitteline envelope and is developed by the follicle cells while the egg is in the ovary.he chorion is one of the four extraembryonic membranes that make up the amniotic egg that provide for the nutrients and protection needed for the embryo's survival. It is located between the albumin, which is the white of the egg, and the eggshell. It encloses the embryo and the rest of the embryonic system.
The purpose of chromosomes in the nucleus of a cell is to contain genetic information that tells the cell what to do, how to behave etc. Chromosomes also contain the informati â¦ on that determines what you look like; whether you have brown hair, blue eyes etc.18 people found this useful.he nucleus contains the DNA of the cell and this is vital for cell division and also for making the proteins that the cell needs to function. 3 people found this useful. Edit. Share to: 1  Biology 101: The Nucleus and Its Responsibilities The nucleus of a cell is like the heart and brain of a cell rolled in to one.