The Structure Of The Common Amoeba: Features Of The Cellular Structure Of The Cyst

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The Structure Of The Common Amoeba: Features Of The Cellular Structure Of The Cyst
The Structure Of The Common Amoeba: Features Of The Cellular Structure Of The Cyst

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Video: What is An Amoeba | Biology | Extraclass.com 2023, February
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  • External structure of the body of amoeba
  • Internal structure
  • Amoeba cyst structure
  • You can defeat parasites!

Common amoeba (Proteus) is a representative of the free-living sarcode class. It differs in a primitive organization and structure, can move using small growths on the membrane - the cytoplasm. It is a single-celled, independent and complete organism.

External structure of the body of amoeba

Outwardly, the amoeba looks like a semi-liquid lump measuring 0.2-0.7 mm. It can be seen using a microscope, and a magnifying glass can be used to examine a large specimen. The entire body is covered with cytoplasm, which covers the nucleus pulposus. When moving, the cytoplasm changes shape - it stretches in one direction and the other.

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Amoeba forms small processes for the movement of food. With the help of pseudopods, it is able to push off surfaces. For movement, it pulls the pseudopod in the right direction, and then flows into it. The speed of movement of the body is approximately 10 mm per hour.

External structure of the body of amoeba
External structure of the body of amoeba
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The absence of a skeleton allows the body to take the desired shape, change it if necessary. There is no organ in the body responsible for the supply of oxygen - breathing is carried out with the help of the whole body.

During movement, the body of the amoeba absorbs a large amount of liquid, in order to get rid of excess, a contractile vacuole is applied, which bursts and pushes out water, then forms again.

She also has no sense organs, but she tries in every possible way to hide from direct sunlight. Shows sensitivity to external stimuli, certain chemicals.

Internal structure

The internal structure of the amoeba can be seen with a microscope. It is a whole organism capable of performing all functions for survival. Its body is covered with a semi-liquid cytoplasmic membrane. The inner layer consists of a more liquid and not so transparent cytoplasm. Inside there is a nucleus with vacuoles.

The digestive vacuole helps to get rid of digestive waste. When in contact with food, the bacteria form a "food cup" on the body, which provides nutrition. When it closes, the digestive juice penetrates inside, due to which a digestive vacuole is formed.

Internal structure
Internal structure
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The food vacuole moves to the edge, connects to the membrane, as a result of which food waste is released. The feeding process is called phagocytosis, and the digestive process takes 12 hours to 5 days. Water absorbed by the whole body forms oxygen. The breathing process is called pinocytosis.

Amoeba cyst structure

The process of life (nutrition, reproduction) of the amoeba occurs in summer. With the onset of cold weather, it stops feeding, the body takes on a rounded shape, the surface is covered with a dense protective shell - a cyst.

Amoeba cyst structure
Amoeba cyst structure
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The bacteria live in ponds, when they dry out, their body is also covered with cysts. Such a shell helps to survive conditions unfavorable for the amoeba. When the surrounding situation improves, she leaves the cyst, continues life in favorable conditions.

The intestinal amoeba cyst has an oval, round shape and may contain a small supply of nutrients. At different periods of development, it has 1-8 nuclei. Amoeba leaves the body with feces, when the cyst gets into favorable conditions, it bursts and continues its vital activity.

Proteus amoeba is a simple single-celled organism. The overwhelming majority lives in salt and fresh water bodies. It has a primitive body structure, which provides the body with all the processes necessary for its existence.

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