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"What will happen to a red blood cell (RBC), which has an internal ion concentration of about 0.9 percent, if it is placed into a beaker of pure water?"

The answer is: "The cell would swell because the water in the beaker is hypotonic relative to the cytoplasm of the RBC."

My question is, why is this the answer? How do I know that 0.9% ion concentration is hypotonic, and what would the concentration look like if the beaker were hypertonic/isotonic?

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Sixta KovacekLv2

8 Jan 2019

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Post-Lab Questions

For each of the tubing pieces, identify whether the solution inside was hypotonic, hypertonic, or isotonic in comparison to the beaker solution in which it was placed.

Which tubing increased the most in volume? Explain why this happened.

What do the results of this experiment this tell you about the relative tonicity between the contents of the tubing and the solution in the beaker?

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

How are excess salts that accumulate in cells transferred to the blood stream so they can be removed from the body? Be sure to explain how this process works in terms of tonicity.

If you wanted water to flow out of a tubing piece filled with a 50% solution, what would the minimum concentration of the beaker solution need to be? Explain your answer using scientific evidence.

How is this experiment similar to the way a cell membrane works in the body? How is it different? Be specific with your response.

some questions have sub category questions within them. thank you

1: what factors affect that rate of diffusion?

2: what conditions would produce the fastest rate of diffusion?

3: state in which direction water will flow ( into the bag, out of the bag, or in and out at an equal rate ). then justify your answeres using terms hypotonic, hepertonic and isotonic, sub category questions too please.

A: beaker contains 40 % sucrose solution; bag contains 40% sucrose solution

B: beaker contains 25% sucrose solution; bag contains 35% sucrose solution

C: beaker contains 40% sucrose solution; bag contains plain water

D: beaker contains 21% sucrose solution; bag contains 20% sucrose solution

4:? make three drawings on a seprate paper to showing the directions of water movement in the following conditions of tonicity /

a: the solution in the beaker is hypotonic to the solution in the bag

B: the solution in the beaker is herpertonic to the soltuion in the bag

C: the solution in the beaker is isotonic to the solution in the bag

5:?what is the tonicity of a surrounding solution whihc causes plant cells to undergo plasmolysis? Describe the appearance of these cells

?6: what happens to red blood cells when they are placed in a hypertonic solution?

7: How do the red blood cells appear compared to normal red blood cells?

plumdeer95

So I learned osmosis and
Marine fish and Freshwater fish

as I know, for the osmosis, water follows higher solute.
For example, when I think about the hypertonic,
I think like this :
because surrounding has higher concentration,
water goes out.

For hypotonic,
because cell(?) has higher concentration than surrounding,
water get into the cell.

But when my lecture was talking about
Fish for Marine and Freshwater, my knowledge was messed up.

the lecture say that fish in freshwater need to maintain a higher ion concentration than surrounding, and they said that the fish in freshwater is hyper osmotic regulator (maintain a hypertonic state)

So what I cannot understand from here is
if fish has more concentration than surrounding,
shouldn't this fish be hypotonic?

why lecture is saying
environment is hypotonic and fish is hypertonic or hyperosmotic regulator????????????

plz explain this on screen
I usually have a really hard time to read with hand writing

greyseal230

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