Structure and Function of the Paramecium with Pictures

The paramecium is a very small, cylindrical single-celled organism, the representative species of the class Ciliata and also a representative species of the protozoa. It lives in freshwater and can generally be collected from ponds and small rivers. 22 species are known worldwide, and common ones include Paramecium caudatum, Paramecium aurelia, Paramecium multimicronucleatum, Paramecium bursaria, and others. Let us take a look at the structure and function of the paramecium along with some pictures!

1. Cytostome: The cytostome, also known as the oral groove, has the main function of feeding.

2. Pellicle: The intake of oxygen and the discharge of carbon dioxide both take place through the pellicle.

3. Micronucleus: The micronucleus contains genetic material and has a reproductive function.

4. Macronucleus: The macronucleus mainly controls the passage of nutrients in and out.

5. Contractile vacuole and collecting canals: The contractile vacuole and collecting canals collect metabolic wastes and excess water and expel them from the body.

6. Cytoproct: The main function of the cytoproct is to expel undigested food residue.

7. Cilia: The paramecium relies on the beating of its cilia to rotate and move forward in water, and the cilia also help the oral groove capture food.

8. Food vacuole: The food vacuole is produced by the paramecium through endocytosis, and after entering the cell it fuses with a primary lysosome to form a secondary lysosome. As the cytoplasm flows, the food within is gradually digested.