Section 7.3 + 7.4 Review

Front

What is diffusion?

Back

Diffusion is the process by which molecules move from an area of high concentration to an area of low concentration without the need for energy (ATP).

Front

Why does diffusion NOT require ATP?

Back

Because the molecules involved have high kinetic energy.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which molecules move across the cell membrane from an area of high concentration to an area of low concentration through a carrier protein.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is a hypertonic solution?

Back

A hypertonic solution has more solutes and less water than the cell it contains, causing the cell to lose water.

Front

What is a hypotonic solution?

Back

A hypotonic solution has fewer solutes and more water than the cell it contains, causing the cell to gain water.

Front

What is an isotonic solution?

Back

An isotonic solution has the same concentration of solutes as the cell, resulting in no net movement of water.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from an area of low concentration to an area of high concentration, requiring energy (ATP).

Front

What is a negative feedback loop?

Back

A negative feedback loop is a process that counteracts a change in a system, helping to maintain homeostasis.

Front

What is a positive feedback response?

Back

A positive feedback response is a process that amplifies a change in a system, leading to an even greater change.