7.1 The Plasma Membrane Components and Structure

In 1935, Davson and Danielli proposed a "railroad track" model of the plasma membrane with proteins as "==blank==" and lipids as "==blank==."

In 1935, Davson and Danielli proposed a "railroad track" model of the plasma membrane with proteins as "==bread==" and lipids as "==filling==."

What is the Fluid Mosaic Model?

A model of the structure of the plasma membrane as a mosaic of components, including phospholipids, cholesterol, proteins, and glycolipids, resulting in a fluid rather than static character.

In a typical human cell, proteins make up about 50% ==blank==, 40% ==blank==, and 10% ==blank== of the plasma membrane's composition.

In a typical human cell, proteins make up about 50% ==lipids==, 40% ==proteins==, and 10% ==carbohydrates== of the plasma membrane's composition.

==Blank== proteins are embedded in the membrane, while ==blank== proteins are on its surfaces. They have roles in transport, enzymatic activity, and cell recognition.

==Integral== proteins are embedded in the membrane, while ==peripheral== proteins are on its surfaces. They have roles in transport, enzymatic activity, and cell recognition.

Carbohydrates on the cell's exterior form the ==blank==, attracting water and aiding in cell recognition and immune response differentiation.

Carbohydrates on the cell's exterior form the ==glycocalyx==, attracting water and aiding in cell recognition and immune response differentiation.

==blank== helps maintain membrane fluidity and buffers against temperature changes.

==Cholesterol== helps maintain membrane fluidity and buffers against temperature changes.

Cells specialized in absorption, like those in the small intestine, have ==blank==—finger-like projections that increase the plasma membrane's surface area.

Cells specialized in absorption, like those in the small intestine, have ==microvilli==—finger-like projections that increase the plasma membrane's surface area.

Celiac disease causes an immune response to gluten, damaging ==blank== and leading to nutrient absorption issues, malnutrition, cramping, and diarrhea. A gluten-free diet is necessary for patients with celiac disease.

Celiac disease causes an immune response to gluten, damaging ==microvilli== and leading to nutrient absorption issues, malnutrition, cramping, and diarrhea. A gluten-free diet is necessary for patients with celiac disease.

Visualize the Plasma Membrane