When an ameoba forms a pseudopod, what part of the cell is "pushing" the cytoplasm?

Question

The plasma membrane? If so how?

Answer 1

Pseudopodia extend and contract through the reversible assembly of actin subunits into microfilaments and of microfilaments into networks that convert cytoplasm from sol to gel. According to a widely accepted model, filaments near the cell's trailing end interact with myosin, causing contraction. Like squeezing on a toothpaste tube, this contraction forces the interior fluid into the pseudopodium, where the actin network has been weakened. The pseudopodium extends until the actin reassembles into a network.

Answer 2

cytoplasm is liquid part of cell, so liquid does not require pushing, it diffuses, but organelles are carried via cellular transport system coordinated by cytoskeleton..
Cytoskeletal of the cell is dynamic in structure, when pseudopod forms cytoskletal elements extend toward that side. And micro filaments form a track to carry vesicle or organelles together with the kinesin or myosin attachment to cargo elements to desired place.

Answer 3

The cell membrane is divided into two, which is the endoplasm and the ectoplasm. When the pseudopodium takes place, ectoplasm with a lower density of organels will move towards the direction it wants to. when the whole plasm moved towars its desired place, it will force in the endoplasm to get to direction it wants. Observe the earthworm. You will understand more.