Membranes and Transport

Front

What is the primary function of the cell membrane?

Back

To control what molecules can enter and leave the cell, helping to maintain homeostasis.

Front

What are the two main components of the phospholipid bilayer in the cell membrane?

Back

Phosphate heads (hydrophilic) and fatty acid tails (hydrophobic).

Front

What is the role of fatty acid tails in the cell membrane?

Back

They prevent water molecules from crossing through the membrane.

Front

What is endocytosis?

Back

A process by which cells engulf substances from the outside environment, bringing them into the cell.

Front

What is active transport?

Back

The movement of molecules across a cell membrane against their concentration gradient, requiring energy (ATP).

Front

What is facilitated diffusion?

Back

A process that allows substances to cross membranes with the assistance of special proteins, without the use of energy.

Front

What is osmosis?

Back

The diffusion of water molecules across a selectively permeable membrane.

Front

What is homeostasis?

Back

The ability of a cell or organism to maintain a stable internal environment despite changes in external conditions.

Front

What is the hydrophilic part of a phospholipid?

Back

The phosphate head.

Front

What is the hydrophobic part of a phospholipid?

Back

The fatty acid tails.