Summary: Human Anatomy & Physiology | 9781292260853 | Elaibe N Marieb, et al

Read the summary and the most important questions on Human anatomy & physiology | 9781292260853 | Elaibe N. Marieb en Katja Hoehn

• 3 Cells: The living units

• 3.2 The plasma membrane is a double layer of phospholipids with embedded proteins

  This is a preview. There are 11 more flashcards available for chapter 3.2
  Show more cards here

• What is the lipid bilayer largely constructed of?

  Largely of phospholipids, with smaller amounts of cholesterol

• Is cholesterol hydrophilic, hydrophobic or both?

  Cholesterol has a hydrophilic region (hydroxyl group), and a hydrophobic region (fused ring system)

• Where are integral proteins located?

  Firmly inserted into the lipid bilayer, most transmembrane

• What is the function of transmembrane proteins?

  Involved in transport and form channels and pores. Others act as carriers that bind a substance and move it through the membrane. Some are enzymes and others are receptors for hormones

• Where are peripheral proteins located?

  They either attach loosely to integral proteins or have a hydrophobic region that anchors them into the membrane

• What is the function of peripheral proteins?

  Supports the membrane from its cytoplasmic side. Some are enzymes, others are motor proteins involved in mechanical functions such as muscle cell contraction.

• What does the glycocalyx consist of?

  The fuzzy, sticky, carbohydrate rich area at the cell surface created by the sugars of glycoproteins and glycolipids.

• How do cells recognize each other?

  The glycocalyx provides identity molecules

• How are the plasma membranes of adjacent cells joined together?

  By specialized cell junctions

• What is a tight junction?

  A series of integral protein molecules in the plasma membrane fuse together. This forms an impermeable junction that separates one fluid filled compartment from another