1. Formation:
- During late anaphase or telophase of cell division, the cleavage furrow starts forming as a shallow groove on the cell surface, usually at the equator of the cell.
- This groove is formed by a ring-like structure made up of microfilaments (actin filaments) and motor proteins (myosin).
2. Contraction:
- The microfilaments within the cleavage furrow begin to contract, pulling the cell membrane inwards.
- This contraction is powered by the interaction of actin and myosin, similar to muscle contraction.
3. Cytoplasm Division:
- As the cleavage furrow deepens, it pinches the cell into two daughter cells, each containing a complete set of chromosomes and organelles.
- The furrow eventually closes off completely, separating the two daughter cells.
In summary, the cleavage furrow acts like a "pinching belt" that divides the cytoplasm during cell division, ensuring that each daughter cell receives a complete set of cellular components.
Here are some important points to remember:
* Cleavage furrows are a characteristic feature of animal cell division. Plant cells divide using a cell plate instead.
* The precise location of the cleavage furrow is determined by the position of the mitotic spindle during nuclear division.
* The formation and contraction of the cleavage furrow require energy and are regulated by various signaling pathways.
Understanding the role of the cleavage furrow is essential for comprehending the fundamental process of cell division, which is vital for growth, repair, and reproduction in multicellular organisms.
