Active Transport, Cell Membrane, and Homeostasis

Front

What is the primary function of the cell membrane?

Back

To regulate what enters and leaves the cell.

Front

Define homeostasis in the context of cellular function.

Back

Homeostasis is the state of equilibrium in which a cell maintains a stable internal environment.

Front

What process is depicted by the movement of substances into the cell via vesicles?

Back

Endocytosis.

Front

What does it mean for a membrane to be selectively permeable?

Back

It means that some molecules can cross the membrane while others cannot.

Front

What is active transport?

Back

The movement of molecules against a concentration gradient, requiring energy.

Front

What is the role of transport proteins in the cell membrane?

Back

Transport proteins facilitate the movement of substances across the cell membrane.

Front

Explain the difference between passive transport and active transport.

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.

Front

What is osmosis?

Back

The diffusion of water across a selectively permeable membrane.

Front

How do cells respond to changes in their external environment to maintain homeostasis?

Back

Cells adjust their internal processes, such as altering membrane permeability or using active transport, to maintain stable conditions.

Front

What is the significance of the fluid mosaic model in understanding cell membranes?

Back

The fluid mosaic model describes the structure of cell membranes as a mosaic of various proteins that float in or on the fluid lipid bilayer, allowing for flexibility and dynamic interactions.