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Apr 1, 2021 · The cell membrane (AKA the plasma membrane) is a thin, flexible structure that surrounds the outside of the cell, creating a physical barrier between the cell interior and its external environment. It consists of a semipermeable lipid bilayer that regulates the passage of materials in and out of the cell.
- Kate Latham
Figure 4.6.2 This closeup of a cell nucleus shows that it is surrounded by a structure called the nuclear envelope, which contains tiny perforations, or pores. The nucleus also contains a dense center called the nucleolus. As you can see in the model pictured in Figure 4.6.2, the membrane enclosing the nucleus is called the nuclear envelope ...
- Christine Miller
- 2020
The cell cycle is the sequence of events in the life of the cell from the moment it is created at the end of a previous cycle of cell division until it then divides itself, generating two new cells. While there are a few cells in the body that do not undergo cell division (such as gametes , red blood cells, most neurons , and some muscle cells), most somatic cells divide regularly.
Oct 31, 2024 · Cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell may be a complete organism in itself, such as a bacterium, or it may acquire a specialized function, becoming a building block of a multicellular organism.
- A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of...
- Cell theory states that the cell is the fundamental structural and functional unit of living matter. In 1839 German physiologist Theodor Schwann an...
- The cell membrane surrounds every living cell and delimits the cell from the surrounding environment. It serves as a barrier to keep the contents o...
Cell. The cell is the smallest, structural and functional unit of an organism. The cell components are mainly involved in carrying out various life functions. To carry out these functions, cells required specialized structures called cell organelles. Main Article: Cells. Tissues
- Structural organisation of a typical multicellular animal is as follows: Cells → Tissues → Organs → Organ system
- Tissues are a group of cells which perform similar functions and possess nearly identical cellular structure.
- Tissues are classified as follows: Nervous tissue Connective tissue Epithelial tissue Muscular tissue
Figure 3.2.1 – Prototypical Human Cell: While this image is not indicative of any one particular human cell, it is a prototypical example of a cell containing the primary organelles and internal structures. Organelles of the Endomembrane System. A set of three major organelles together form a system within the cell called the endomembrane system.
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A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, Golgi apparatus, mitochondria, and so on. The cellular contents are surrounded by a double layer, cell membrane. These cellular structures and cell junctions are elaborated in this tutorial.
