Understanding Diffusion

The video explains diffusion, a passive transport process where particles move from high to low concentration without external energy. It highlights diffusion's role in daily life, such as spreading aromas, and its biological significance in oxygen transport from alveoli to blood. The concept of facilitated diffusion, involving carrier proteins, is also discussed, emphasizing its importance in oxygenating blood.

What is an example of diffusion in everyday life?

• A car moving uphill

• Perfume scent spreading in a room

• Water boiling

• A ball rolling down a hill

Which type of transport does not require external energy?

• Osmosis

• Passive transport

• Active transport

• Facilitated transport

Which of the following is NOT a characteristic of passive transport?

• Occurs naturally

• Moves substances from high to low concentration

• Involves carrier proteins

• Requires no external energy

What is the role of a concentration gradient in diffusion?

• It facilitates the movement of particles from high to low concentration

• It requires energy to function

• It prevents diffusion

• It allows particles to move from low to high concentration

What happens to particles in a concentration gradient?

• They move to areas of higher concentration

• They move to areas of lower concentration

• They require energy to move

• They remain stationary

How does oxygen move from the alveoli to the blood?

• By facilitated diffusion

• Using energy from ATP

• Through active transport

• By passive diffusion

In the human body, where is oxygen concentration higher?

• In the brain

• In the alveoli

• In the blood

• In the muscles

What is facilitated diffusion?

• Diffusion that uses carrier proteins

• Diffusion that occurs only in plants

• Diffusion that moves particles against the concentration gradient

• Diffusion that requires energy

What is the main difference between simple and facilitated diffusion?

• Simple diffusion occurs only in plants

• Facilitated diffusion uses carrier proteins

• Simple diffusion uses carrier proteins

• Facilitated diffusion requires energy

Which process allows oxygen to bind with red blood cells?

• Facilitated diffusion

• Osmosis

• Simple diffusion

• Active transport