Carrier-Mediated Transport

1
Carrier-Mediated Transport
Pore
Cell
Solute
2
What stops a cell from filling up with solutes?

• Ion gradients act continually on cells so what
  must the cell do to maintain homeostasis?
• The cell has pumps that push ions out of the cell
  to maintain homeostasis
• Pumps that use ATP(energy) to work are called
  ACTIVE
• Pumps or pores that work without ATP(energy) are
  called PASSIVE

3
Most important Pumps

• Sodium-potassium pumps(Na-K) this pump burns one
  ATP to push 3 Na out of cell and 2 K into the
  cell
• Sodium-glucose transport protein(SGLT) binds Na
  and glucose outside of cell. Uses ATP and Na
  gradient to push glucose into cell
• ATP synthetase As Na enters the cell ATP is
  made from ADP and P