Lecture 1 (Water - Membrane Barrier)

Question 1

Internal Environment

Answer 1

• Extracellular Fluid

Question 2

Homeostasis

Answer 2

• Maintain, stable ideal conditions in internal environment (ECF)

Question 3

Water Property

Answer 3

• Water = Polar: e- not distrib equally
  
  • H bonds between
• Other - Nonpolar = e- dist equally eq

Question 4

Ions

Answer 4

• have net e charge
• Four Important
  
  • Na + , Cl-, K+, Ca++

Question 5

Phospholipid Property

Answer 5

• Amphipathic
  
  • one side polar other nonpolar
• Miscelles
• Lipoproteins
• Bilayer of cell membrane

Question 6

Cell Membrane

Answer 6

• Phospholipid bilayer w/ embedded proteins
• Nonpolar Core/ Outside Polar = Barrier for polar molecule + ion
• Allows nonpolar molecules + small polar by diffusion