Cell Organelles


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Examining plant cells under the microscope

Each cell has a complex structure that can be viewed under a microscope and contains many even smaller elements called organelles.


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Plant cells contain some organelles not found in animal cells, such as cell walls and chloroplasts. Each organelle has specific functions in the life and health of the cell, and cell health is important for the well-being of the entire organism. All plant and animal cells, which are eukaryote organisms , contain a true nucleus bounded by a nuclear membrane.

Prokaryotes such as bacteria and archaea don't have a nucleus. This structure contains a eukaryotic cell's DNA and directs cell activities. The cell membrane is double-layered in animals, and forms the outer cell boundary that protects the cell contents and regulates what goes in and out of cells.

The Cytoplasm and Cellular Organelles – Anatomy and Physiology

In plants, a plasma membrane lies just underneath the tough cell wall that supports plant tissue. The endoplasmic reticulum is an extensive membrane complex extending throughout the cytoplasm from the outer membrane of the nuclear envelope. It contains about half of the cell's membranous tissue. Rough endoplasmic reticulum contains ribosomes that produce proteins. Smooth endoplasmic reticulum manufactures lipids. Also called the Golgi complex or Golgi body , this organelle looks like a stack of flattened water balloons. It processes the proteins produced by the endoplasmic reticulum and ribosomes, modifying and storing them until it packages them in vesicles.

Lysosomes also come from the Golgi apparatus. Rough endoplasmic reticulum is covered in ribosomes , giving it a grainy look.

Eukaryotic Organelles

Proteins are made here and are packaged up for transport around, or out of, the cell. Smooth endoplasmic reticulum.

Smooth endoplasmic reticulum has different functions in different cells. Mitochondria are very important organelles - it is in the mitochondria that respiration occurs. There are thousands of them in every cell in your body.

Organelles of the Endomembrane System

They often called the 'power houses' of the cell. The nucleus.

Cell Organelles- Part 1

The nucleus is the largest organelle within animal cells. The nucleus controls cell activity. It also contains the cell's chromosomes.

The chromosomes are made up of the genetic information the DNA that makes you who you are. Go back to the Respiration page. Respiration Respiration occurs in every cell of your body. The cell membrane The cell membrane packages up the cell and all its organelles.

Endoplasmic Reticulum

The cytoplasm The cytoplasm of a cell is not really an organelle - it is the fluid the organelles are bathed in. Vacuoles Vacuoles are storage areas.


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  7. The golgi body The golgi body or the golgi apparatus makes some of the chemicals produced within the cell. Lysosomes Lysosomes contain enzymes that break down cell material if these enzymes were not contained within lysosomes, they would eat away the cell. Ribosomes There are thousands of ribosomes inside a cell.

    Structure and Functions of Cells

    Rough endoplasmic reticulum Endoplasmic reticulum is made up of a network of membranes folded into a series of sheets or tubes. Smooth endoplasmic reticulum Endoplasmic reticulum is made up of a network of membranes folded into a series of sheets or tubes. Mitochondria Mitochondria are very important organelles - it is in the mitochondria that respiration occurs. The nucleus The nucleus is the largest organelle within animal cells.

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