ANIMAL CELL PARTS and their functions - Summary with diagrams!

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If we analyze the structure of a building, we can identify that it is composed of different parts made of various types of materials and "subunits", such as the bricks that make up the walls. Animal cells can be considered as those bricks and the union of Many of them can form larger structures such as tissues in multicellular organisms, or be the only functional structure of a living being in unicellular organisms. It was in the second half of the 17th century, with the invention of the compound microscope and the subsequent progressive improvement of lenses, when an animal cell, specifically a blood cell, was first described.

If you were looking for a summary of the parts of the animal cell with schematicsStay in this Green Ecologist article in which we will delve into the interior of an animal cell, we will know the different types that there are and the parts that compose it.

What is an animal cell and its types

The animal cell is the basic functional unit of the animal tissues, What are they multicellular organisms. It is, like the plant cell, a type of eukaryotic cell characterized by having a true nucleus and specialized organelles, which differentiates it from prokaryotic cells. There is a wide variety of cells in animals, but did you know that there are more than 200 different classes in the human body? Next, we describe the types of animal cells and their functions more characteristic, although they are not present in all animals.

  • Epithelial cells: normally they are the cells that are present in the walls of the organs, forming the covering tissues. They present different specializations according to the body in which they are, since this specialization determines their function. For example, the cells of the epithelium of the small intestine present microvilli to increase the absorption surface of nutrients.
  • Nerve cells: two types of cells make up nervous tissue: neurons and glial cells. Neurons are those that are specialized in the transmission of the nerve impulse through the synapse between neurons or between neuron and muscle cell. Glial cells, on the other hand, do not transmit nerve impulses, but serve as support and maintenance for neurons. Due to their function, both have a branched or star shape, which facilitates communication between them.
  • Muscle cells: There are three main types of muscle cells: those of smooth muscle tissue, skeletal and cardiac. They have the characteristics that they are contractile because they have the ability to transform chemical energy into mechanical energy. The forms of these cells are varied since, depending on the tissue they form, they have one function or another. Those of smooth muscle are elongated in appearance, those of skeletal and cardiac have striae, but the latter are characterized by an involuntary rhythmic contraction.
  • Blood cells: There are three different types of blood cells: red blood cells (or erythrocytes), white blood cells (or leukocytes), and platelets. Erythrocytes are the most peculiar, because they are the only cells in the human body that do not have a nucleus. These cell types generally move through the bloodstream and serve for the transport and exchange of oxygen and CO2 (red blood cells), production of antibodies for the immune response (white blood cells) or clotting for the maintenance of the circulatory system.
  • Fat cells: They are adipocytes, large cells whose function is to store energy in the form of fatty acids inside, secrete proteins and hormones and function as thermal and mechanical protection.
  • Cartilaginous cells: They are called chondrocytes and have a flattened and rounded shape and the presence of microvilli. In the human body, these cells are present in tissues found in the ribs, joints, nose … and together they have a support function.
  • Hosea: They are responsible for the growth of bone and its degradation. There are three types: osteoblasts, osteoclasts, and osteocytes.

Apart from knowing these functions of animal cells and their types, we also recommend reading this other article on the Types of animal tissues.

Image: SlideShare

List of the parts of the animal cell

To know the main characteristics of the animal cell, it is convenient to start by learning what its parts and functions are. In summary, this is the list of the parts of the animal cell:

  • Core
  • Plasma membrane
  • Cytoplasm
  • Endoplasmic reticulum
  • Golgi apparatus
  • Centrosome
  • Cilia and flagella
  • Mitochondria
  • Cytoskeleton

Apart from continuing reading this article to know details about the characteristics and functions of animal cell partsWe also advise you to read this other post about the Difference between a eukaryotic cell and a prokaryotic cell.


Is he organelle specialized in processing and managing information of the cell. Normally, eukaryotic cells have single core, but there are exceptions where we can find more than one. The shape of this organelle varies depending on the cell it is in, but it is generally round in appearance. In it the genetic material is stored in the form of DNA (Deoxyribonucleic acid) and is responsible for coordinating the activities of the cell: from growth to reproduction. The nucleus, in addition, has a visible structure called nucleolus inside it, which is formed by the concentration of chromatin and proteins. Mammals have a number between 1 and 5 nucleoli in the cell.

Plasma membrane

The plasma membrane is the structure that envelops the cell and it is present in all living cells. It is responsible for encompassing their content and protecting them from the external environment, which does not mean that it is a hermetic membrane, since it has pores and other structures through which certain molecules pass necessary to carry out the internal processes of the cell. animal.


The cytoplasm of animal cells the space between the cytoplasmic membrane and the nucleus, which surrounds all the organelles. It is made up of 70% water and the rest is a mixture of proteins, lipids, carbohydrates and mineral salts. This medium is vital for the development of cell activity.

Endoplasmic reticulum

The endoplasmic reticulum is an organelle that is shaped like flattened sacs and stacked tubules that share the same internal space. The lattice is organized into several domains that are: the rough endoplasmic reticulum, with flattened membranes and associated ribosomes, and the smooth endoplasmic reticulum, more irregular in appearance and without associated ribosomes.

Golgi apparatus

It is a set of membranes in the form of cisterns responsible for the distribution and delivery of chemicals from the cell, that is, it is the center of cell secretion. It is similar in shape to Golgi complex or apparatus of plant cells, formed by three parts: the membranous sacs, tubules, through which substances are sent to the interior and exterior of the cell, and, finally, the vacuoles.


The Centrosome It is characteristic of the animal cell and is a cylindrical and hollow structure composed of two centrioles arranged perpendicular to each other. The composition of this organelle is made of protein tubules and has a very important function in the cellular division, since it organizes the cytoskeleton and gives rise to the achromatic spindle during mitosis. It can also cause cilia or flagella.

Cilia and flagella

The cilia and flagella of animal cell are appendages formed by microtubules that give cell mobility. They are present in unicellular organisms and are responsible for their locomotion and in other cells they serve to remove the environment or for sensory function. Regarding the number, the cilia are more abundant than the flagella.


The mitochondria are the organelles of the animal cell to which nutrients arrive and are transformed into energy, in a process called respiration. They are elongated in shape and have two membranes: an internal one that folds into ridges and the other smooth external one. The number of mitochondria present in each cell depends on its activity (for example, in muscle cells there will be a high number of them).

Image: SlideShare


To finish off the list of the main parts of animal cells, we mention the cytoskeleton. It is made up of a set of filaments found in the cytoplasm and has a support function for organelles, in addition to the function of shape the cell.

Difference between animal and plant cell

As we have already talked about what are the parts of the animal cell and their functionsNow we will clarify that, although there are some characteristics and organelles that animal and plant cells have in common, the truth is that they present clear differences. These are the main differences between an animal cell and a plant cell:

  • The most characteristic is that the animal cell can be found only in living beings of the animal kingdom and the plant cell is present only in plants and algae.
  • On the other hand, the animal cell does not have an external cell wall or chloroplasts.
  • One of the parts of the animal cell that the plant does not have is the centrosome and, in addition, it has more numerous vacuoles inside.
  • In addition, the presence of cilia or flagella is also more frequent in animal cells, since in plants only cilia usually appear in the gamete phase of some plants or algae.

In the table below and in this other article you can see more about the Difference between animal and plant cells.

If you want to read more articles similar to Parts of the animal cell, we recommend that you enter our Biology category.

  • Atlas of Plant and Animal Histology. The cell:
  • National Geographic:
  • Molecular expressions: Molecular Expressions Cell Biology: Animal Cell Structure (
  • Sepúlveda Saavedra, July (2012). Histology Atlas Text: Cell and Tissue Biology. Collection Of the workshop: Series "Education." McGraw-Hill Education.
  • Campos, Patricia (2002). Biology / Biology. Editorial Limusa / Vicens Vives.
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