Membrane Transport and Potential Concepts

The video explores membrane transport, focusing on facilitated diffusion and active transport. Facilitated diffusion involves protein channels aiding the movement of molecules across membranes. Active transport requires ATP to move substances against concentration gradients. Co-transport mechanisms, including symport and antiport, are discussed. The concept of membrane potential, involving electrochemical gradients and action potentials, is also covered.

What is the primary function of facilitated diffusion in membrane transport?

• To create an electrochemical gradient

• To move materials from low to high concentration

• To use ATP for energy

• To facilitate the diffusion of materials that can't pass through the membrane

Which type of transport requires ATP to move materials against the concentration gradient?

• Osmosis

• Passive transport

• Active transport

• Facilitated diffusion

What is the role of protein pumps in active transport?

• To move ions with the gradient

• To transport water molecules

• To facilitate diffusion

• To create a concentration gradient

What is co-transport also known as?

• Secondary active transport

• Passive transport

• Primary active transport

• Facilitated diffusion

In symport, how do ions move across the membrane?

• Using ATP

• In the same direction

• Without a protein channel

• In opposite directions

What does membrane potential refer to?

• The number of protein channels in the membrane

• The concentration of ions inside the cell

• The voltage potential across the cell membrane

• The amount of ATP in the cell

What triggers the release of energy in a nerve cell?

• A shift in membrane potential

• A change in temperature

• A decrease in ion concentration

• An increase in ATP

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

• To facilitate passive diffusion

• To maintain membrane potential

• To transport glucose

• To create a protein channel

How many sodium ions are pumped across the gradient by the sodium-potassium pump?

• Two

• Four

• Five

• Three

What analogy is used to describe the resetting of the membrane potential?

• A water wheel

• A pulley system

• A mouse trap

• A battery