The video explains cell transport mechanisms essential for maintaining stable internal conditions. It covers the semipermeable nature of the cell membrane and the phospholipid bilayer structure. Passive transport methods like diffusion, osmosis, and facilitated diffusion are discussed, highlighting their energy-free nature. Active transport processes such as endocytosis, exocytosis, and the sodium-potassium pump are also explained, emphasizing their energy requirements. The video concludes with a summary of these transport methods.

What does 'semipermeable' mean regarding the cell membrane?

• It changes permeability based on the cell's needs.

• It prevents any objects from passing through.

• It allows only certain objects to pass through.

• It allows all objects to pass through.

What is the structure of a phospholipid in the cell membrane?

• Both head and tail are hydrophobic

• Both head and tail are hydrophilic

• Hydrophilic head and hydrophobic tail

• Hydrophobic head and hydrophilic tail

What is the process called when water moves through the cell membrane?

• Active transport

• Osmosis

• Facilitated diffusion

• Diffusion

Which of the following does NOT require energy?

• Sodium-potassium pump

• Facilitated diffusion

• Exocytosis

• Endocytosis

How do ions typically move across the cell membrane?

• Using a protein channel

• Through direct diffusion

• By altering the membrane structure

• Via osmosis

What role do protein channels play in cell transport?

• They prevent any transport across the cell membrane

• They facilitate the movement of specific ions across the cell membrane

• They assist in the movement of molecules from low to high concentration

• They provide energy for active transport

What is endocytosis?

• The movement of water through the cell membrane

• A process to expel materials from the cell

• A type of passive transport

• The engulfing of objects to bring them into the cell

Which of the following is an example of active transport?

• Osmosis

• Diffusion

• Exocytosis

• Facilitated diffusion

What is the main function of the sodium-potassium pump?

• To facilitate diffusion

• To move sodium and potassium ions against their concentration gradient

• To assist in osmosis

• To produce ATP

What is the primary difference between passive and active transport?

• The involvement of the cell membrane

• The requirement of energy

• The size of molecules transported

• The direction of molecule movement