Fac vs bulk

• What substances are mentioned for transport in the material?

  Glucose and amino acids
• How do molecules move according to the material?

  Molecules move down the pressure gradient
• What is required to move substances against a gradient?

  ATP is required
• What is the process of moving large molecules called?

  Exocytosis
• What do nerve cells release into the synapse?

  Neurotransmitters
• What is the purpose of neurotransmitters in the synapse?

  To transmit signals between neurons
• What is the process of bringing substances into cells called?

  Endocytosis
• What energy is used in endocytosis?

  Energy is used for receptor binding
• What happens during vesicle formation in endocytosis?

  Invagination occurs in the membrane
• How are neurotransmitters reabsorbed?

  Via specific membrane proteins
• What is the function of carrier proteins?

  Transport one substance at a time
• What is required for carrier proteins to function?

  Energy is needed for transport
• How do channel proteins differ from carrier proteins?

  Channel proteins allow free passage of molecules
• How are channel proteins described in terms of their state?

  Always open
• What is the rate of passage through channel proteins?

  They allow slow passage of molecules