Session 6 - Movement Of Ions And Molecules Through Membranes Flashcards
What is the value of of Sodium ions in the Extracellular fluid as compared to the Intracellular fluid?
ECF -142 mEq/L
ICF - 10 mEq/L
What is the value of of potassium ions in the Extracellular fluid as compared to the Intracellular fluid?
ECF - 4 mEq/L
ICF - 140 mEq/L
What is the value of of proteins in the Extracellular fluid as compared to the Intracellular fluid?
ECF - 2 g/dl
ICF - 16 g/dl
What is the structure of charges on a cell at rest?
At rest, a normal, healthy cell is positively charged outside and negatively charged on the inside.
What is the importance of the resting cell being polarised i.e. positive outside and negative inside ?
It is critical for maintaining cell volume and enables cells to generate action potentials
What is the phospholipid bilayer of the cell membrane composed of?
Phospholipid molecules made up of a hydrophilic head and a hydrophobic tail.
What holds the phosphate head and the fatty acid tail of a phospholipid molecule together?
Glycerol
Name 3 types of proteins found as part of the cell membrane.
Surface proteins
Integral proteins/Globular proteins
Peripheral proteins
Which part of the cell membrane do lipid soluble molecules move through?
Phospholipids
Which part of the cell membrane do water soluble molecules move through?
Membrane proteins such as channels, gates and carriers
List 5 examples of non-polar molecules that move through the cell membrane.
Oxygen
Carbon dioxide
Lipids
Cholesterol
Steroids
What kind of molecules are lipid soluble?
Non-polar molecules
What kind of molecules are water soluble?
Ions and polar molecules
List 5 examples of water soluble molecules that move through the cell membrane.
NaCl
KCl
Glucose
Proteins
Calcium ions
How does water move through the cell membrane?
Through special protein channels called aquaporins.
Water molecules rapidly move through these channels in a single file.
