Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

25 Cards in this Set

  • Front
  • Back
What does the plasma membrane do?
Regulates movement in and out of the cell
What is the phospholipid bilayer?
This is the bilayer heads are polar and the tails are created by fatty acid and are non polar
Membrane Proteins do what?
Help transport material across the membrane
What is meant by the phospholipid bilayer being semi permiable or selectively permiable
Lipid soluble molecules pass through as do no polar and small polar molecules pass through as well..

IONS and most polar molecules are repelled
What allows impermiable items to pass through like ions and other polar molecules?
Channel proteins
What is diffusion?
Random movement of molecules
What type of energy does diffusion use?
When molecules diffuse across a membrane, net movement of molecules from high to low concentration eventually produces ???
The process of passing through the membrane is also referred to as???
What is needed when the molecule is too large to use a channel
Carrier Proteins
What is active transport
Carrier Proteins are sometimes equipped to use ATP’s energy to push molecules against a concentration gradient
What is Passive transport
Simple Diffusion across the plasma membrane is referred to as passive transport.

Passive transport that uses a carrier protein is sometimes referred to as facilitated diffusion
Molecule Pumps are
molecules that active transport “pumps” molecules against a concentration gradient.
What is Co _transport
Cells can use diffusion of one item (e.g. sodium) to push a different molecule against a concentration gradient (e.g. glucose). Organs specialized in absorption are often lined with cells that have co- transport proteins (e.g. intestine and kidney).
Very large materials enter or exit the cell via ???
endocytosis or exocytosis
Exocytosis is ?
a small bubble of membrane fuses with the outer plasma membrane to release its contents to the outside
how many Forms of Endocytosis do we recognize here and what are they?
Receptor-mediated endocytosis
What is pinocytosis
a small amount of water-soluble material is brought into the cell with a pinched off bubble of membrane called a vesicle
what is Receptor-mediated endocytosis
uses receptors to accomplish basically the same thing.
What is phagocytosis
a large particle (even a small cell such as a bacterium) is brought into the cell with a vesicle.
Isotonic environment
Solute concentration is the same inside and out. Equal diffusion of water inside and out. Normal cell
Hypertonic environment
Solute concentration is higher outside the cell. Water diffuses out of the cell. Crenated cell
Hypotonic environment
Solute concentration is lower outside the cell. Water diffuses into the cell. Hemolysis of the cell
Hydrostatic pressure
exerts a force on molecules which can force them across a semipermeable membrane
What can force molecules from lower to high concentration areas and oppose osmotic pressure