Cell Transport

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (ATP).

Front

What is the role of the cell membrane?

Back

The cell membrane controls what substances may enter or leave the cell, helping to maintain homeostasis.

Front

What does it mean for a membrane to be semi-permeable?

Back

A semi-permeable membrane allows certain substances to pass through while blocking others.

Front

What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain a stable internal environment despite external changes.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy and moves substances against their concentration gradient.

Front

What are lipid tails in the cell membrane?

Back

Lipid tails are hydrophobic (water-repelling) parts of phospholipids that make up the cell membrane.

Front

What are lipid heads in the cell membrane?

Back

Lipid heads are hydrophilic (water-attracting) parts of phospholipids that face the aqueous environment inside and outside the cell.

Front

What is ATP and its role in active transport?

Back

ATP (adenosine triphosphate) is the energy currency of the cell, providing the energy needed for active transport.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, influencing the direction of movement during transport.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move substances across the cell membrane.