Endoplasm and ectoplasm, Biology

Endoplasm and Ectoplasm

Under the light microscope, we can find two regions in the-cytoplasm .of the amoeba;

  1.  The central region, the endoplasm which is fluid like sol and
  2. The ectoplasm, the region of the cytoplasm just beneath the plasma membrane, which is gel-like.

In the phase contrast microscope, we can see that the endoplasm contains abundant particles and membranous organellae, found in constant random motion, indicating their freedom of movement in the sol region of the cytoplasm. Ectoplasm contains a three-dimensional network of cross-linked actin fibres, and all other organelle are excluded from the region. This gel region apparently decides the shape of the pseudopodium and may transmit tension from the regions of cellular contraction to the sites of contact with the substratum. It is believed that the ectoplasm contains non-cross-linked actin filaments and probably myosin filaments also.

As a pseudopodium elongates and the sol-like endoplasm streams into it, the region of the endoplasm near the tip of the pseudopodium apparently transforms into - gel-like ectoplasm. Simultaneously, the ectoplasm elsewhere in the cell transforms into sol-like endoplasm, probably by an uncrossing of linking actin fibres. Proteins such as actin, fimbrin and fodrin are involved in the sol-to-gel transition. They cross-link actin filaments and bundle them to each other. Cross linking of actin filaments produces a network confining the movement of individual actin molecules and results in the semisolid gel state.

Posted Date: 1/16/2013 4:02:51 AM | Location : United States







Related Discussions:- Endoplasm and ectoplasm, Assignment Help, Ask Question on Endoplasm and ectoplasm, Get Answer, Expert's Help, Endoplasm and ectoplasm Discussions

Write discussion on Endoplasm and ectoplasm
Your posts are moderated
Related Questions

What kind of eye defect can give rise to short-sightedness? Long eyeballs, large eyeballs, too powerful a lens or a combination of these defects can give increase to short-sigh

What is an analogy for a smooth endoplasmic reticulum? Endoplasmic reticulum (ER) is such as a manufacturing plant, like a factory, where proteins and lipids are made. This is

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Define the Concept of Health Care? We are aware of the fact that health is a fundamental human right. Thus, it becomes imperative for the State to assume responsibility for the

What happens when auxin concentration in some structures of the plant is over the action range of the hormone? In some of parts of the plant (roots, stem, lateral buds) there a

what is biological sickness of soil and its management

Q. Why is the use of condoms not just a contraceptive method but also a health protection behavior? The use of condoms besides being an efficient contraceptive method also help

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Composite Endosperm - Variants of Endosperm In the family Loranthaceae, the development of endosperm is unique. The ovary lacks ovules. The sporogenous tissue located at the b