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
PHOSPHOLIPIDS Most abundant lipid present in cell membrane, also called membrane lipid. It is made up of lipid & phosphoric acid. The basic phospholipid is phosphat

Pneumonia: Pneumonia is an inflammation with consolidation  of  the parenchyma of  the lung. It occurs most commonly in infants and young children and may occur as primary dis

What are the Abnormalities of gaze Normal gaze is when visual axes both eyes are parallel in primary gaze. when visual axes are not parallel in primary gaze, it is abnormal ga

Release of lysosomal enzymes from white blood cells during a local immune attack can contribute to the symptoms of inflammation. Suppose, to alleviate inflammation, you develop a d

what are the phylum of kingdom protozoan

Explain about the Vacuum Evaporators? It is common to construct various vacuumised vessels in series that is why the product moves from one vacuum chamber to the next and thus

Database Search: Once an open reading frame or the partial amino acid sequence has been pre-determined, the investigator compares sequence with others in the databases using a com

Xerarch - Ecology Successions initiated on bare rock, wind-blown sand, rocky talus slopes, or other situations where there is an extreme deficiency of water are termed xerarch

Q. What is the importance of the glucose blood level for human health? The glucose blood level (glycemia) must be kept normal if it is abnormally low there is not sufficient gl

What is covalent bonds? Covalent Bonds :  Covalent bonds form when atoms share electrons in order to become more stable. Instead of gaining electrons or losing electrons enti