Question 1.
how do substance like carbon dioxide and water move in and out of the cell. discuss.
Question 2.
Why is the plasma membrane called the selectively permeable membrane?
Answers
question 1
how do substance like carbon dioxide and water move in and out of the cell. discuss.
Question 2.
Why is the plasma membrane called the selectively permeable membrane?
this is your answer....
Answer 1.
when the concentration of carbon dioxide is more inside the cell then outside, carbon dioxide diffuses out of the cell. if carbon dioxide concentration inside the cell is less, carbon dioxide moves inside the cell from outside by the process of diffusion. similarly oxygen enters and diffuses out from the cell by the process of diffusion.
the water move in and out of the cell by the process of osmosis. osmosis is the passage of water from a region of high water concentration through a semi permeable membrane to a region of low water concentration.
Answer 2.
the plasma membrane is called as the selectively permeable membrane because it only allows entry and exit of some selected molecules through the cells. it also prevents movement of some other material.