10 Questions
Why is the cell membrane called a selectively permeable membrane?
Because it only permits the entry and exit of some materials
What is the function of the plasma membrane?
It separates the contents of the cell from its external environment
How do substances like carbon dioxide or oxygen move across the cell membrane?
By diffusion
What happens to CO2 inside a cell when its concentration is high?
It moves out of the cell by diffusion to a region of low concentration
What is the role of oxygen in terms of cellular entry?
Oxygen diffuses into the cell when its internal concentration decreases
Why is it important for the cell membrane to be selectively permeable?
To regulate which substances can enter and exit the cell
Which process describes the movement of substances from a region of high concentration to low concentration?
Diffusion
What substance accumulates in high concentrations inside a cell and needs to be excreted out?
Carbon dioxide
In what direction does CO2 move when there is a concentration difference inside and outside a cell?
Out of the cell
Which substance enters a cell by diffusion when its internal levels decrease?
Oxygen
Test your knowledge on the function of the cell membrane in regulating the movement of substances into and out of the cell. Learn about selective permeability and how certain materials can pass through the membrane while others are restricted.
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