Nucleus - Nucleus - Control center for the cell. Most cells...

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Nucleus - Control center for the cell. Most cells have only one nucleus, although some (skeletal, bone destruction cells, some liver cells) are multinucleated. All cells within the human body are nucleated except red blood cells. The nucleus is the largest organelle in the cell. Spherical to oval in shape. Three distinct regions or structures: nuclear membrane, nucleoli, chromatin. The nuclear membrane encloses a jelly like colloidal fluid called nucleoplasm. The nuclear membrane is a double membrane surrounding the nucleus. Each membrane is a phospholipid bilayer. The outer membrane is continuous with the E.R. and may be studded with ribosomes. At various points, the two layers fuse and nuclear pores penetrate through the fused regions.The nuclear membrane is selectively permeable. Because of the larger pores passage of substances is much freer. Protein molecules imported from the cytoplasm and RNA exported from the nucleus pass easily through the pores. The nucleoli are dark staining spherical bodies found in the nucleus and are made of rRNA and
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Nucleus - Nucleus - Control center for the cell. Most cells...

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