Cells and internal enviroment

Which is more likely to cross a cell membrane by simple diffusion?

• Fatty acid molecule

• Glucose molecule

What are the functions of the cell membrane? (choose TWO).

• Structural barrier to keep cell contents

• Facilitate absorption

• Maintains intracellular cell environment

• Removal of waste

What is the percentage of water per body weight in humans?

• 40%

• 50%

• 60%

• 70%

Potassium ions (K+) are found at high concentrations intracellularly and sodium ions (Na+) at high concentrations extracellularly

• True

• False

Movement of water molecules through aquaporin is known as:

• Facilitated diffusion through channel

• Simple diffusion

• Facilitated diffusion through carrier

• Active transport