Moving into and out of the blood: diffusion, osmosis and active transport | Exit Quiz | Oak National Academy

Which small particles move into and out of the blood by diffusion?

• lactic acid

• glucose

• urea

• oxygen

Answer explanation

Lactic acid and proteins are too big to be able to diffuse across cell membranes.

Tags

NGSS.HS-LS2-3

How does water move in and out of the blood?

Answer explanation

Water moves by osmosis. Like during diffusion, the water moves from areas of high to low concentration.

Which particles are moved into and out of the blood by active transport?

• glucose

• lactic acid

• amino acids

• Carbon dioxide

• Water

Answer explanation

Carbon dioxide and water are small molecules that can diffuse across cell membranes.

True or false? Diffusion occurs down a concentration gradient.

• true

• false

Answer explanation

In diffusion, the net movement of the particles is from an area of high concentration to an area of lower concentration. Therefore, diffusion happens down a concentration gradient.

Which of these processes require energy to take place?

• diffusion

• active transport

• osmosis

Answer explanation

Active transport requires energy to move large molecules in and out of the blood.

Who best describes net movement?

• 
• 
• 

Answer explanation

Net movement is the overall movement of particles from one area to another. In diffusion, the net movement of the particles is from an area of high concentration to an area of lower concentration.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2