Amoeboid movement

Amoeboid movement

Amoeboid movement is a special way that some cells move around. It looks like crawling. The cell pushes out part of itself called a pseudopodium, which means "false-feet." This helps the cell move forward by sliding its inner material, called cytoplasm, into the new pseudopodium.

Many simple living things, like amoebae such as Amoeba proteus and Naegleria gruberi, use this method to get around. Even some cells in our own bodies, like leukocytes, which are a type of white blood cell, can move this way.

This kind of movement can also help some diseases spread. For example, certain cancers known as sarcomas are good at moving in this way.

Scientists are still learning how amoeboid movement works. They know it involves changes in the cell’s shape and tiny structures inside it called actin filaments. This movement also helps cells sense and move toward important signals, a process called chemotaxis.

Types of amoeboid motion

Amoeboid movement is how cells can move in different ways. One way is called crawling. In crawling, a cell stretches out a part called a pseudopod to grip a surface, then pulls itself forward. This helps the cell move at a steady speed, even on bumpy surfaces.

Another way is gliding. Gliding is faster on smooth surfaces but slower on rough ones. Some cells glide by stretching out larger pseudopods. Others use a different method where a small part of the cell sticks to the surface and pushes the cell forward. There is also swimming, where cells move through water. Some use tiny hair-like structures called cilia or flagella, but others can swim using pseudopods or by moving their inner material in a wave-like motion.

Molecular mechanism of cell motion

The protoplasm of an amoeba has two layers: an outer ectoplasm that is thick and jelly-like, and an inner endoplasm that is more fluid. The amoeba moves when the fluid part goes to the front, turns jelly-like, and helps the cell crawl forward. This process happens again and again, letting the amoeba move.

Scientists study tiny parts inside the cell, like actomyosin and actin-binding protein, that help this movement. Some cells can also move by making round bulges called blebs. These bulges push the cell forward in a different way. The bulges change shape and size as the cell moves.