How do sodium ions move across the plasma membrane of an animal cell into the cytoplasm?

Question

through channels formed by integral membrane proteins, active transport, simple diffusion, OR from low sodium concentration outside the cell to high concentration in the cytoplasm of the cell

Answer 1

plasma membrane a semi-permeable membrane
there are 3 types of transport
1 uniport --------this is active transport of H+ where ATP is used so here H+ are actively transported out side of of the cell
from now all transports will depend on uniport that is H+
2 symport [for negative ions to get in ] -----the hydrogen which went out will combine with negative ion and will come inside the cell
3 antiport [for positive ions like Na+, K + etc ]-------the hydrogen will come in so that sodium will come but if sodium has to go in from out side its based on concentration gradient

Answer 2

Sodium ions will move across a membrane based on a form of osmosis called diffusion. That is from high concentrations into low concentrations in a solution.

Think of it as salt water intrusion between salt water and fresh water. The salt water is much heavier because of the sodium molecules permeating the water and making it more viscous and therefore more bouyant.

Answer 3

it cannot move by diffusion because you have a semi permeable membrane therefore the answer would be active transport with the expenditure of energy as they are moving against the concentration gradient from a region of lower concentration to one of high concentration.