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Cellular Physiology: Ion Channels and Homeostasis

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Cellular Physiology: Ion Channels and Homeostasis

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Questions and Answers

What is the primary function of the plasma membrane?

To synthesize proteins

To establish a boundary and protect cellular contents (correct)

To store genetic information

To facilitate cell division

What is the main component of the plasma membrane?

Proteins

Carbohydrates

Phospholipids (correct)

Nucleic acids

What is the arrangement of phospholipids in the plasma membrane?

Hydrophilic parts face outwards, hydrophobic parts face inwards (correct)

Both hydrophilic and hydrophobic parts face outwards

Both hydrophilic and hydrophobic parts face inwards

Hydrophilic parts face inwards, hydrophobic parts face outwards

What is the function of structural proteins in the plasma membrane?

To provide cell support and shape Signup and view all the answers

What is the term for the movement of ions, nutrients, and waste molecules through the plasma membrane?

Selective permeability Signup and view all the answers

What is the fluid mosaic model?

A dynamic structure of lipids and proteins Signup and view all the answers

What is the main function of channel proteins?

To allow water, ions, and proteins to flow passively through the bilayer Signup and view all the answers

What is the role of glycoproteins in cell membranes?

To help in cell-to-cell communications and adhesion Signup and view all the answers

What is the primary function of aquaporin proteins?

To provide transmembrane pores for water transport Signup and view all the answers

What occurs when a cell is exposed to a hypertonic external solution?

The cell will shrink due to osmotic water loss Signup and view all the answers

What is the term for the diffusion of water from a less concentrated to a more concentrated solution through a selectively permeable membrane?

Osmosis Signup and view all the answers

In which regions are aquaporin proteins typically found?

In regions where water transport is physiologically important (kidney, intestine) Signup and view all the answers