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Protozoa: Structure and Locomotor Organelles

The size and shape of protozoa vary based on the types of species. For example, the causative agent of Kala azar, Leishmania donovani has a size range of 1 to 4 micrometers in length, while the Amoeba proteus is 600 micrometers or more in size. Some members of ciliates can reach 2,000 micrometers or 2mm.

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MN Editors

Structure of Protozoa

The size and shape of protozoa vary based on the types of species. For example, the causative agent of Kala azar, Leishmania donovani has a size range of 1 to 4 micrometers in length, while the Amoeba proteus is 600 micrometers or more in size. Some members of ciliates can reach 2,000 micrometers or 2mm.

Intracellular Structure of Protozoa

Protozoa is a eukaryotic cell, therefore like other eukaryotes they contain a cytoplasm which is surrounded by a cell envelope and also contains the nucleus.

Cytoplasm

Nucleus

Plasmalema and Other Cell covering region

Pinocytosis: uptake of Nuids and soluble nutrients through small invaginations in the cell membrane that subsequently form intracellular vesicles

Feeding Structure

Cysts

Other protective Structure

Protozoa protect themselves by forming various structures or materials within the membrane-bound vesicles, such as;

Locomotor Organelles of Protozoa

For locomotion, Protozoa uses three types of locomotor organelles such as pseudopodia, flagella, and cilia. There are also other protozoa which carry out their motility by the gliding mechanism.

Cilia: Some protozoa used cilia for locomotion as well as for the ingestion of foods and often function as a tactile organelle. These are fine and short threadlike extensions from the cell. The length of cilia varies based on their location on cell or they can be uniform in length. These are arranged in longitudinal, oblique, or spiral rows, inserted either on the ridges or in the furrows.

Citation

APA

MN Editors. (May 7, 2021).Protozoa: Structure and Locomotor Organelles. Retrieved from https://microbiologynote.com/protozoa-structure-and-locomotor-organelles/

MLA

MN Editors. "Protozoa: Structure and Locomotor Organelles." Microbiology Note, Microbiologynote.com, May 7, 2021.

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