Chapter 4 - Membrane & Transport
Section 1 - Membrane Structure
LECTURE VIDEO
DESCRIPTION
Forget brick walls—your cells are guarded by a bouncer made of fat who can’t make up his mind.
This video on Membrane Structure is your backstage pass to the Fluid Mosaic Model, the greasy, protein-studded VIP lounge of life itself. We’re diving deep to explain:
- The Phospholipid Bilayer:Meet the fickle bouncers—hydrophilic heads who love water, and hydrophobic tails who absolutely despise it. Their identity crisis is the foundation of all life.
- Cholesterol:The cell’s very own mood manager. Is it too fluid? Too rigid? Cholesterol is there to stabilise the drama and keep the membrane from having a meltdown.
- Membrane Proteins:The polymaths, who simply have too many skills.
- Glycolipids & Glycoproteins:The cell’s fancy nametags and recognition system.
Stop seeing the membrane as a static wall and start seeing it for what it is: a dynamic, ever-changing party that keeps you alive.
TIMESTAMPS
STUDY RESOURCES
00:00 – Intro
00:13 – Overview Of This Video
01:37 – Phospholipid Bilayer
09:00 – Formation Of A Phospholipid Bilayer
12:43 – The Fluid Mosaic Model
21:12 – Membrane Fluidity
32:16 – Role Of Membrane Proteins
42:31 – Rapid Summary
44:23 – Questions & Answers
46:25 – Outro
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!Â
Section 2 - Membrane Transport
LECTURE VIDEO
DESCRIPTION
They’re not just bouncers at the club of life (keeping the riff-raff out) — they’re sophisticated doormen, revolving doors, and emergency exits all in one. Dive into the bustling city that is the cell membrane, where the traffic never stops!
This video pumps up the volume to explain:
- Simple & Facilitated Diffusion: From the laid-back Oâ‚‚ just strolling through, to the glucose that needs a fancy protein doorman to let it in.
- Active Transport: The molecular superhero that defies gravity (and concentration gradients) using pure ATP energy. Someone’s gotta work the night shift!
- Osmosis: The dramatic saga of water, where it decides to throw a pool party in a cell or abandon it for a desert, leading to cells looking either plump or pruney.
- Bulk Transport: When the molecules are just too big to be polite. Watch as the membrane literally gobbles up lunch (endocytosis) or takes out the trash (exocytosis) in a spectacular display of cellular gluttony.
We’ll cut through the semi-permeable mystery to show you how your cells manage the ultimate logistics operation. No ticket required, just bring your curiosity
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:13 – Overview Of This Video
00:01:12 – Simple Diffusion
00:20:56 – Facilitated Diffusion
00:32:17 – Osmosis
00:37:53 – Water Potential
00:44:57 – Osmosis V.S Facilitated Diffusion
00:46:52 – Osmosis In Animal Cells
00:50:23 – Osmosis In Plant Cells
00:57:15 – Active Transport
01:06:08 – Sodium/Potassium Pump
01:10:19 – Bulk Transport (Endocytosis & Exocytosis)
01:20:19 – Surface Area To Volume Ratio
01:29:18 – High Yield Summary
01:34:35 – Questions & Answers (#1, #2, #3, #4, #5, #6)
01:50:56 – Outro
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!Â
Section 3 - Cell Signalling
LECTURE VIDEO
DESCRIPTION
🎠Ever wondered how your liver knows you just ate a donut? Or why your heart speeds up when you see your crush? Cells aren’t mind readers—they’re just really, really good at gossip.
In this video, we’re diving into the high-stakes drama of cell signalling — where molecules are the messages, receptors are the bouncers, and one wrong signal can start a cellular riot.
We’ll decode:
- How cells slide into each other’s DMs with ligands, receptors, and second messengers.
- How glucagon screams at liver cells via a GPCR and turns glycogen into glucose (the ultimate “snack now” signal).
- How a GPCR works (Hint: It’s like a molecular mousetrap that triggers an army of “G proteins”).
Think of it as TikTok for your trillions of cells — except the trends are life-saving, the drama is biochemical, and there’s no algorithm… just pure, unadulterated biology.
TIMESTAMPS
STUDY RESOURCES
00:00 – Intro
00:13 – Overview Of This Video
00:59 – In A Nutshell
10:17 – Types Of Receptors
17:53 – Real Example
21:51 – G-protein Coupled Receptors
27:40 – Questions & Answers
31:33 – Outro
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!Â