Diffusion

What is the net movement of a substance traveling down its concentration gradient called?

• Osmosis

• Diffusion

• Active transport

• Facilitated transport

Which characteristic describes diffusion?

• It requires an input of energy (like ATP).

• It moves substances against their concentration gradient.

• It is a passive transport, meaning it does not require added energy.

• It only occurs when molecules stop moving.

If all other factors remain constant, how does a higher temperature affect the rate of diffusion?

• It slows down the diffusion rate.

• It stops diffusion completely.

• It increases the diffusion rate.

• It has no impact on the diffusion rate.

In the human body, how does oxygen typically move from the alveoli of the lungs into the bloodstream?

• Through active transport.

• By facilitated diffusion.

• By simple diffusion.

• Using bulk transport.