SC.912.L.14.2 Cell Transport

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What is active transport?

Back

Active transport is the movement of ions or molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (ATP).

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What is passive transport?

Back

Passive transport is the movement of ions or molecules across a cell membrane without the use of energy, typically moving from an area of higher concentration to an area of lower concentration.

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What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move substances across a cell membrane without energy.

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What is co-transport?

Back

Co-transport is a mechanism that moves two substances across a cell membrane simultaneously, where the movement of one substance down its concentration gradient drives the movement of another substance against its gradient.

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What is a semi-permeable membrane?

Back

A semi-permeable membrane is a type of biological membrane that allows certain molecules or ions to pass through it by diffusion and occasionally by facilitated diffusion.

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What happens to a freshwater fish in saltwater?

Back

When a freshwater fish is placed in saltwater, its cells lose water and shrink due to osmosis, as water moves out of the cells to balance the higher salt concentration outside.

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What are centrioles?

Back

Centrioles are cylindrical organelles found in animal cells that play a key role in cell division by helping to organize the mitotic spindle.

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What is osmosis?

Back

Osmosis is the diffusion of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What is the role of the cell membrane?

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The cell membrane regulates what enters and exits the cell, providing protection and support while maintaining homeostasis.

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What is diffusion?

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Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until equilibrium is reached.