Podcast
Questions and Answers
What is the main function of membrane transport in a cell?
What is the main function of membrane transport in a cell?
To maintain internal equilibrium (homeostasis) by allowing the smooth movement of molecules across cell membranes.
Describe the composition of the plasma membrane.
Describe the composition of the plasma membrane.
The plasma membrane is a phospholipid bilayer that is semi-permeable and contains proteins.
What is a concentration gradient?
What is a concentration gradient?
A concentration gradient is a difference in the concentration of a solute between two neighboring regions.
Explain the concept of simple diffusion in passive transport.
Explain the concept of simple diffusion in passive transport.
How does active transport differ from passive transport?
How does active transport differ from passive transport?
What is the role of gradient dissipation in cell transport?
What is the role of gradient dissipation in cell transport?
Why is membrane transport important for the cell?
Why is membrane transport important for the cell?
How does membrane transport separate the cell's inner realm from the external surroundings?
How does membrane transport separate the cell's inner realm from the external surroundings?
What types of substances can enter or leave cells by simple diffusion?
What types of substances can enter or leave cells by simple diffusion?
How does the extent of the concentration gradient affect the rate of diffusion?
How does the extent of the concentration gradient affect the rate of diffusion?
Explain why more massive molecules diffuse more slowly.
Explain why more massive molecules diffuse more slowly.
How does temperature affect the rate of diffusion?
How does temperature affect the rate of diffusion?
What effect does solvent density have on the rate of diffusion?
What effect does solvent density have on the rate of diffusion?
What is facilitated diffusion, and how does it differ from simple diffusion?
What is facilitated diffusion, and how does it differ from simple diffusion?
Explain the difference between channel mediated diffusion and carrier mediated diffusion.
Explain the difference between channel mediated diffusion and carrier mediated diffusion.
What are the two types of proteins involved in facilitated diffusion?
What are the two types of proteins involved in facilitated diffusion?
What is the process that entails the diffusion of water molecules across a selectively permeable membrane?
What is the process that entails the diffusion of water molecules across a selectively permeable membrane?
What is the term used to describe a solution with the same solute concentration as the cell?
What is the term used to describe a solution with the same solute concentration as the cell?
How does a cell respond when placed in a hypotonic solution?
How does a cell respond when placed in a hypotonic solution?
What type of solution results in cell shrinking when a cell is placed in it?
What type of solution results in cell shrinking when a cell is placed in it?
What is the process that requires energy input to move substances against their concentration gradient?
What is the process that requires energy input to move substances against their concentration gradient?
Which pump is responsible for the flow of impulses along nerve and muscle cells?
Which pump is responsible for the flow of impulses along nerve and muscle cells?
What provides the energy for active transport?
What provides the energy for active transport?
What happens to the cell size when placed in an isotonic solution?
What happens to the cell size when placed in an isotonic solution?
What is the role of ATP in the process of moving ions across the cell membrane?
What is the role of ATP in the process of moving ions across the cell membrane?
How many Na+ ions can the carrier protein accommodate during the resting stage?
How many Na+ ions can the carrier protein accommodate during the resting stage?
What happens to the 3 Na+ ions once the carrier protein changes shape?
What happens to the 3 Na+ ions once the carrier protein changes shape?
How many K+ ions can the carrier protein take up from the outside after releasing Na+ ions?
How many K+ ions can the carrier protein take up from the outside after releasing Na+ ions?
What triggers the release of K+ ions inside the cell by the carrier protein?
What triggers the release of K+ ions inside the cell by the carrier protein?
What is the ratio of Na+ ions moved out of the cell to K+ ions moved into the cell?
What is the ratio of Na+ ions moved out of the cell to K+ ions moved into the cell?
What is the role of endocytosis in cellular processes?
What is the role of endocytosis in cellular processes?
How does exocytosis differ from endocytosis?
How does exocytosis differ from endocytosis?
Describe what happens during exocytosis at the cell membrane.
Describe what happens during exocytosis at the cell membrane.
What initiates the movement of substances in and out of the cell through vesicles?
What initiates the movement of substances in and out of the cell through vesicles?
