The structure, function and picture of paramecium

Paramecium is a small, cylindrical, single-celled organism, a representative species of ciliates and protozoa. Living in fresh water, it can be found in ponds and streams. 22 species are known in the world. There are large paramecium, binuclear paramecium, multinucleate paramecium, green paramecium and so on. Let's take a look at the structure, function and pictures of paramecium.

1. Cell mouth: cell mouth is also known as mouth groove, and its main function is to ingest food.

2. Surface membrane: both oxygen intake and carbon dioxide excretion pass through the surface membrane.

3. Micronucleus: the micronucleus contains genetic material and plays a reproductive role.

4. Macronucleus: macronucleus mainly controls the entry and exit of nutrients.

5. Telescopic bubbles and collection tubes: telescopic bubbles and collection tubes collect metabolic waste and excess water and arrange them into the body.

6. Anus: the main function of anus is to expel food residue that cannot be digested.

7. Cilia: paramecium rotates in the water by the swing of cilia, which can also help to feed in the mouth groove.

8. Food vesicles: food vesicles are produced by endocytosis of paramecium and fuse with primary lysosomes to form secondary lysosomes. As the cytoplasm flows, the food in it is gradually digested.