Which of the following organisms would lose the most water...

Key Concepts

Water Potential Gradients in Aquatic Environments

Water potential gradients are created by differences in solute concentrations between an organism’s internal fluids and its surrounding water. In aquatic organisms, these gradients determine the direction and rate of water movement across permeable membranes, influencing how much water is lost or gained through processes like diffusion across the gills.

Osmosis

Osmosis is the passive movement of water molecules across a semipermeable membrane, moving from an area of lower solute concentration to one of higher solute concentration. This process is fundamental in understanding how water exchange occurs in biological systems, particularly in structures like gills where fluids interact directly with the environment.

Osmoregulation

Osmoregulation refers to the mechanisms by which organisms maintain the balance of water and solutes in their internal environment. This is critical for aquatic organisms that must counteract the effects of osmosis, whether they are in freshwater or marine settings, to avoid cell dehydration or overhydration.

Transcript

00:01 So to answer problem three, i think the easiest way is to begin by narrowing down what our options definitely can or cannot be.

00:12 So we're talking about an organism losing water to the outside.

00:16 So let's draw a cell.

00:18 Everything is just easier to look at as one cell.

00:20 So this organism loses water to the outside.

00:24 That means that the inside of the cell must have less ions and less solutes outside.

00:39 Because, remember, water, do that in blue, moved from the low concentration of solutes to the high concentration.

00:51 So, this cell would lose water only if it was in a liquid that had more.

00:58 More salt in it.

01:00 And so the liquid we know that has more salt in it, what that environment is, is the ocean.

01:07 So to start, answer must be something that lives in the ocean.

01:30 All right? that's our first clue.

01:33 Now, if we look at our options, there's obviously only two options that we can pick from.

01:39 The other two tell us that they live in fresh water.

01:44 Let's look at these two.

01:45 Organisms scroll down here get a hold of it oh there we go all right so let's look at marine bony fish we'll just look at their cells again because remember looking at the cell is the easiest thing to do so marine bony fish they have a low concentration just like that cell that we looked at they don't have that many salts on the inside of their cells compared the outside the outside is way more so we know this, testing cells, from looking at their cells.

02:28 So water will flow from a high concentration to a low concentration of water.

02:36 Or in other words, water will go from where you have a lot of salt.

02:44 So it leaves where there isn't as much and it goes to where you have a lot.

02:49 And so this cell would actually start to dry out for the cell would lose water.

03:02 So the cell would lose water.

03:05 And so this means the only way for these marine fish to get that water back, let's see, we'll draw a fish.

03:16 The only way for them to get that water back is to actually drink it...

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