Understanding Cellular Transport: Active and Passive Transport

🔁Passive transport is the movement of molecules from areas of high concentration to low concentration, while active transport requires energy and moves molecules against the concentration gradient.

💦Osmosis is the diffusion of water across a semipermeable membrane and is driven by differences in solute concentration.

📊Facilitated diffusion occurs when materials diffuse across the cell membrane with the help of membrane proteins called channel and carrier proteins.

⏱️The rate of diffusion is influenced by factors such as the size and nature of the diffusing substance, the number of specific transport proteins, and the physical environment.

🔵🔴Tonicity refers to the osmolarity and permeability of a solution. Cells can experience isotonic, hypertonic, or hypotonic conditions.

What is the difference between passive and active transport?

—Passive transport does not require energy and moves molecules from areas of high concentration to low concentration, while active transport requires energy and moves molecules against the concentration gradient.

What is osmosis?

—Osmosis is the diffusion of water across a semipermeable membrane, driven by differences in solute concentration.

What is facilitated diffusion?

—Facilitated diffusion is the process of materials diffusing across the cell membrane with the help of membrane proteins called channel and carrier proteins.

What factors influence the rate of diffusion?

—The rate of diffusion is influenced by factors such as the size and nature of the diffusing substance, the number of specific transport proteins, and the physical environment.

What is tonicity?

—Tonicity refers to the osmolarity and permeability of a solution. Cells can experience isotonic, hypertonic, or hypotonic conditions.

00:00[Music] The cell uses mechanisms to transport materials across the membrane.

00:13Passive transport is the most common method and occurs through diffusion, where molecules move from areas of high to low concentration.

00:45Facilitated diffusion occurs through channel and carrier proteins, allowing molecules to pass through the hydrophobic region of the cell membrane.

01:25Factors such as the size and nature of the diffusing substance, the number of transport proteins, and the physical environment influence the rate of diffusion.

02:59Osmosis is the diffusion of water across a semipermeable membrane, driven by differences in solute concentration.

03:57Tonicity refers to the osmolarity and permeability of a solution, affecting the movement of water into and out of the cell.