Explain how each of the follow passes from the extracellular

Explain how each of the follow passes from the extracellular fluid into cells:

(1) oxygen

(2) calcium ion

(3) ethanol

(4) glucose

(5) growth factors

Solution

Solution:

1)Oxygen passes from the extracellular fluid into cell through the process of diffusion.Conentration outside of the cell is very high and inside the cell is low.So,substance enter the cell through from high concentration to lower concentration.

2)Calcium is transported through the ion channels present in the plasma membrane.

3)Ethanol diffuse into our blood from digestive system and then entered into cell with the help of proteins.

4)Glucose enter the cell through facilitated diffusion through the plasma membrane.In this type of diffusion a substance enter the cell with the help of special proteins present in the cell membrane.

5)Growth factor attached to the receptors present on the surface of cells in which they want to enter.