Cells are Everywhere
BY AUSTIN BILSKI
Organizational Structure
The levels of organizational structure can be categorized in many levels. They can be categorized by, each having specific function, beginning with the smallest, least complex structure, the cell, to tissues, organs, organ systems, to the largest, most complex structure, the organism. Cells are the smallest part. Then comes the tissues that cover it. Then the organs are the 3rd largest.
Cells make up tissues. Tissues make up organs. Organs make up organ systems and organ systems make up a living organism.
The unique structure and chemical composition of individual organelles in cells allow them to perform functions within the cell. Both plant and animal cells have cell membranes. Mitochondrion produces energy for cell functions, and cytoplasm that surrounds the organelles within the cell itself. There are some organelles that are found in plant cells that aren't in animal cells, like a cell wall. Another prominent organelle in plants is a large fluid-filled central vacuole which the cell uses to store water and other substances. Vacuoles can be found in animal cells, but not as much as plant cells.
The Cell Theory
The cell theory says that the cell is a fundamental unit of structure, function and organization in living things. Every living thing is made up of one or more cells.The cell is the basic unit of structure and function and is the smallest unit that performs life functions.
Parts of eukaryotic cells
The very middle is the nucleus. Out side of it is the nucleus membrane. Then the liquid around it is the cytoplasm. Then other parts of the cell include chloroplast and mitochondria. Then on the out side is the cell membrane. Then on the outside is the cell wall.
Definitions
Nucleus- the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
Cell wall- a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria.
cell membrane- the semipermeable membrane surrounding the cytoplasm of a cell.
cytoplasm- Cytoplasm is a thick solution that fills each cell and is enclosed by the cell membrane.
mitochondria- an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
chloroplast- Chloroplasts are the food producers of the cell.vacuole- a space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid.
endoplasmic reticulum- a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane.
