Question

What 4 membrane properties are used to make the membrane selectively permeable?

a. 1. Endocytosis
2. Diffusion
3. Facilitated transport.
4. Active transport.
b. Pure water
c. Active transport.
d. Facilitated transport.

Answer 1

The cell membrane's selective permeability is achieved through active transport, passive diffusion, facilitated diffusion, and endocytosis, each contributing to homeostasis.

Step-by-step explanation:

The cell membrane is selectively permeable, which means it allows certain substances to pass through while restricting others. This selective permeability is crucial for maintaining homeostasis within the cell. The four properties that contribute to this are:

• Active transport: This process uses energy, usually in the form of ATP, to move substances against their concentration gradient, from an area of lower concentration to an area of higher concentration.
• Passive diffusion: Substances move from an area of higher concentration to an area of lower concentration without the use of energy.
• Facilitated diffusion: This form of passive transport involves substances moving down their concentration gradient through a membrane protein, without requiring energy.
• Endocytosis: The cell membrane engulfs external materials, forming vesicles that allow their transport into the cell. This process requires energy.

Each of these transport mechanisms allows the cell to regulate the passage of ions, molecules, and substances essential for its survival and function, ensuring that the internal conditions remain constant despite changes in the external environment.