Cell Membrane Functions and Structure

The phospholipid bilayer is composed of two layers of phospholipids with hydrophilic heads facing outward and hydrophobic tails facing inward. It acts as a semi-permeable barrier that controls what enters and exits the cell.

Integral proteins span the membrane and facilitate transport and communication, while peripheral proteins are loosely attached and provide support or signaling.

Cholesterol helps maintain membrane fluidity and stability, ensuring the membrane does not become too rigid or too fluid under varying temperatures.

<p>Carbohydrates, often bonded to proteins or lipids, are important for cell recognition, signaling, and interaction with other cells.</p> Signup and view all the answers

<p>The hydrophilic heads face outward towards the water inside and outside the cell, while the hydrophobic tails face inward, creating a barrier that selectively allows substances through.</p> Signup and view all the answers

<p>Membrane proteins, particularly integral proteins, act as receptors that allow cells to receive signals and respond appropriately, facilitating communication between cells.</p> Signup and view all the answers