Transport

Question 1

briefly describe the process of co transport of a glucose molecule

Answer 1

• the sodium ions are actively transported out of the epithelial cells into the blood
• this maintains a much higher concentration of sodium ions in the lumen
• sodium ions then diffuse into the epithelial cells down the concentration gradient
• the glucose pass into the blood plasma via facilitated diffusion

Question 2

what is simple diffusion

Answer 2

the net movement of molecules from high to low concentration

Question 3

why is facilitated diffusion considered a passive process

Answer 3

because it relies on the kinetic energy of the diffusing molecules

Question 4

contrast simple and facilitated diffusion

Answer 4

• simple can diffuse non polar like oxygen
• faciliated diffuses charged and polar molecules

Question 5

what 2 things are involved with the facilitating of diffusion

Answer 5

• carrier proteins
• protein channels

Question 6

why is facillitated diffusion neccesary

Answer 6

charged ions and polar molecules cant diffuse because of their hydrophobic nature and phospholipid tails