Learning Goals:
Compare different types of active transport.
Explain the role of ATP in active transport.
Identify the role of a concentration gradient within active transport.
Compare and contrast active and passive transport.
Next, you will watch a video displaying a process that is related to active transport.
As you watch, think about the following questions:
What is occurring?
What structures on the cell are involved?
What do you think is needed for what you see to occur?
In the previous video, you saw an example of how the immune system works to destroy foreign cells.
The large cell in the center was a human macrophage cell, which a cell of the immune system.
The small cells around it were red blood cells from a sheep. The human macrophage was engulfing the sheep RBC's because they recognized them as foreign cells.
When macrophages engulf material (invading cells and bacteria) this is a form of active transport.
Endocytosis
Exocytosis
Protein Pumps
Next, you will watch a video that discusses these three types of active transport.
Pay attention for any differences between each type of active transport, as well as the role of the cell membrane and the vesicle.
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Endocytosis | arrow_right_alt | Used when molecules and ions pass through the cell membrane against the concentration gradient; it utilizes ATP as an energy source. |
Passive Transport | arrow_right_alt | Occurs when a vesicle merges with the cell membrane to bring material into the cell. |
Protein Pump | arrow_right_alt | Occurs when a vesicle merges to release material from the cell. |
Exocytosis | arrow_right_alt | The general movement of molecules across a cell membrane using ATP. |
Active Transport | arrow_right_alt | The movement of molecules across a cell membrane without the use of ATP. |
The protein pump is located in the
Molecules moving against the concentration gradient move from an area of
The sodium and potassium ions need a protein pump to pass through the cell membrane, because...
Protein pumps are efficient because they...
Next, you will watch a video that compares active and passive transport.
Pay attention for:
similarities between active and passive transport.
differences between active and passive transport.
types of active and passive transport.
Provide two similarities between active and passive transport.
Is ATP required for:
active transport:
passive transport:
Movement up or down the concentration gradient:
active transport:
passive transport:
Provide two examples of active transport.
Provide two examples of passive transport.
Movement of particles from low to high concentration.
Against the concentration gradient.
Uses protein pumps.
ATP is used as the energy source - this is why it's active.
Endocytosis and Exocytosis
Movement of bulk materials into (endocytosis) and out (exocytosis) of the cell by utilizing vesicles.
Vesicle - constructed of the same material as the cell membrane; made when they are needed.
Do not use protein pumps.
If molecules are moving from an area of low to high concentration,
Endocytosis and exocytosis rely on two structures to move molecules into and out of the the cell; one of them is the cell membrane, the other is a
True or false - A protein pump is an example of endocytosis since it brings molecules into the cell.
Which of these - endocytosis, exocytosis, osmosis, protein pump - is not an example of active transport?
From what you have learned in this activity, explain why it might be that active transport is necessary in order for a cell to survive.
Provide a short list of some things that you learned in this activity.
How has your confidence changed regarding your understanding of active transport?
