Osmosis and Water Potential (Updated)

Contents:
00:00 Video Intro
0:59 Osmosis Definition
4:20 Osmosis in Animal Cells Example
7:00 Osmosis in Plant Cells Example
7:30 Water Potential
9:22 Create Something Prompt!

We are so appreciative of feedback we receive as it helps us continue to improve. In this video, we say the word "molecules" several times. Chemically speaking---the term "molecule" may be ok when referring to water but not salt as we did in 2:54. Salt is formed by ionic bonds [not molecular (covalent) bonds like you would see in water].

Vocabulary includes solute, solvent, passive transport, hypertonic, hypotonic, isotonic, equilibrium, water potential, pressure potential, turgor pressure, and solute potential.

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[AmoebaSisters]

We like to pin clarifications & corrections at the top of our videos! We are so appreciative of feedback we receive as it helps us continue to improve. In this video, we say the word "molecules" several times. Chemically speaking---the term "molecule" may be ok when referring to water but *not* salt. Salt is formed by ionic bonds [not *molecular* (covalent) bonds like you would see in water] so we removed that statement. We also had removed a statement regarding the size of salt affecting its ability to cross a membrane: this video does not mention that salt disassociates in water, so the fact that a salt compound is larger than a water molecule is *not* the correct reasoning. Just to add: in our cell transport video, we mention ions generally cannot travel across the membrane unassisted, which would be more relevant to this. We also notice in the comments that people have questions about the diagram at 5:34. Many textbooks, in our experience, focus on the solution the cell is placed in only. Our diagram at 5:34 actually labels both the cell (as either hypertonic or hypotonic) AND the solution (as either hypertonic or hypotonic). If assuming no added pressure, look for the area that is hypertonic. It may be the cell that is hypertonic or it may be the solution that is hypertonic. *But as the diagram shows, the hypertonic area (assuming no pressure) is where the net movement of water will go.* We try to include addressing the cell as well as its surrounding solution, because Pinky noticed her students otherwise tended to memorize terms corresponding to swelling or shrinking, which turned out to hurt understanding. Hope that helps! :)

[duai]

When YouTube can teach you better than your professor.
I can’t describe how thankful I’m, you saved my grades

[jgdevelops]

I'm taking a college Anatomy and Physiology class and still use these videos as a reference for recalling generalized info. Honestly these are great videos for teaching purposes and are great at engaging your target audience, I'm thoroughly impressed and hope to see consistency through the upcoming years.

[Bailey.]

I like how my teacher gives us these to watch instead of accually teaching us

[Nyckoka]

Incredible video.
Fun fact, my teacher was the one who recommended your channel to my class.
Good job on making this insane quality and easy to understand videos.

[taestea]

currently in a Amoeba Sister marathon for finals

[Henkiwashere]

Who else is studying for a test. Ap bio anyone?

[esha]

bet you're watching this a day before your exam 😭

[alexandarbezanovski]

My college class made this so much more complicated than it needed to be. You guys do such a great job at explaining!!! I've been watching your videos since high school and you never disappoint amoeba sisters!

[robertaroveta]

Can she be my teacher you literally taught me more in 9 mins than my teachers in 8 weeks

[zehraali]

When i was in 9th grade, i watched your videos and got an A in bio. Now i am in 12th grade but i still love to watch your videos!

[istifed]

Absolute gold. I study for medical exams and I got confused by the term osmosis. I love when something is explained so simply that even a kid could understand. Thanks!

[phyllos]

thanks to you guys, I can now understand SOME sort of biology... I've always been bad at memorizing, and the teachers at our school aren't that good with making us UNDERSTAND rather than telling us to memorize them.
anyways, its 3 am here, and I'm studying biology for my exam tomorrow. wish me luck! :D <3

[TomahawkH]

A fun way to demonstrate osmosis at home is with Umibudo (sea grapes.) Umibudo is packed in super salty water, which makes them shrivel up (by osmosis.) When you rehydrate them in fresh water, you can see them swell up as the water rushes in by osmosis! Osmosis right before your eyes!

[tyronehuff]

I found this video while researching the osmotic pressure in the fermentation of rum - if you use undiluted molasses, the sugar concentration can be up to 24% and yeast can't perform under that much osmotic pressure. This video was so helpful in really understanding what that phrase means!

[Coton_Candy]

That fact that two random amoebas on the internet can do a better job of teaching than my teachers

[jayla.a]

How crazy is the an 8minute video helped me understand this better than my hour lecture.

[ethansilva]

I still watch these even tho I learned this about a year ago, you’re videos are just so great! Always learning a few things even tho I feel like I know the subject!

[laurenconway]

Hi Amoeba sisters! I'm an A level Biology student in the UK, and I watched your videos a lot when studying for GCSEs. Imagine my joy when I realised you cover A level topics! I love the art style (props to you, Petunia) and the explanations are superb. Thank you!

[adiarenas]

I totally wish you were my biology teacher! You explain something meant to be complicated so simply and make it so easy to understand. Thank you!! 🙏🏻❤️