Name: ______Date: ______

Passive Transport

  1. Draw a Diagram for each of the following three conditions that a cell may be subject to.

Be sure to show concentrations of both Solute and Water in PPT

Indicate directions of motion for both solute and water by using arrows!

  1. Hypertonic Solution:

Extracellular concentration=25 PPT Salt

Intracellular concentration= 10 PPT Salt

  1. Hypotonic Solution:

Extracellular concentration=10 PPT Salt

Intracellular concentration= 25 PPT Salt

  1. Isotonic Solution:

Extracellular concentration=25 PPT Salt

Intracellular concentration= 25 PPT Salt

2. The following diagram shows simple diffusion of salt across the cell membrane.

a. If there are 1000 pieces that make up the solutions in each chamber, what are the concentrations of both Salt and Water in each chamber?

a. Extracellular Salt concentration ______PPT

b. Extracellular Water Concentration ______PPT

c. Intracellular Salt Concentration ______PPT

d. Intracellular Water concentration ______PPT

b. Which term correctly describes the solution the cell is floating in?

Hypertonic, Isotonic, Hypotonic?

c. 1. Which direction will water move?

2. Which direction will salt move?

  1. What will happen to the cell if it remains in this environment?
  1. Oxygen is an essential gas to living things. It is used by cells for respiration: that is to break down sugars into energy (ATP) that the cells need in order to survive and maintain homeostasis. CO2 is a deadly poison that if not expelled from the lungs will cause death.

When you inhale, you take air into your lungs that is highly concentrated in Oxygen (O2) and not concentrated in Carbon Dioxide (CO2). The concentration of O2 in the air we breathe is approximately 210 PPT, while the concentration of O2 in the deoxygenated blood returning to the lungs is about 40 PPT. The concentrations of CO2 is opposite, with lung concentrations of fresh air being less than 10 PPT and blood concentrations being at almost 100 PPT.

1. Describe the Concentration Gradient that exists for both O2 and CO2! (Be sure to say where we find areas of high concentration and low concentration for each gas.)

2. Which direction will Oxygen move?Why? Which direction will CO2 Move? Why?

3. Does this scenario show active or passive transport? Specifically which kind? (Choose from this list: Diffusion, Facilitated diffusion, Osmosis, Bulk Transport, Protein Pumps)? List at Least three Reasons Why?

  1. Next to each Beaker, express the concentrations in Parts Per Thousand (PPT) and then indicate which direction both the solute and solvent will move if left alone (Passive Transport).

(Assume the membrane is permeable to both solute and water)

For cells 10-18, the particle size of the solute is not able to diffuse through the semi-permeable membrane.