Cell Transport Cell Processes https www youtube comwatch
Cell Transport & Cell Processes https: //www. youtube. com/watch? v=6 fhbb. Fd 4 ic. Y
What the Function? • Protect the cell. • Support the cell. • Determines what goes in & out of the cell. • We say it’s selectively permeable.
What the Structure? • The plasma membrane is a lipid bi(two)-layer membrane with proteins and other molecules scattered throughout.
What the Structure? • There are 4 main structures we will investigate… 1) Phospholipids: • Lipids that make up the cell membrane. • They form a bi-layer. • The phosphate head is hydrophillic, or “water-loving. ” • The fatty acid tails are hydrophobic, or “water-fearing. ”
What the Structure? • There are 4 main structures we will investigate… 2)Transport/Channel Proteins: • Proteins that help carry substances across the membrane, or allow molecules to pass through a channel.
What the Structure? • There are 4 main structures we will investigate… 3)Glycoproteins: • Proteins with carbohydrate chains that help neighboring cells communicate, interact, & stick together.
What the Structure? • There are 4 main structures we will investigate… 4)Cholesterol: • A type of hydrophobic lipid that changes the fluidity of the membrane.
Fluid Mosaic Model… • The cell membrane is also known as the fluid mosaic model. • Fluid: because individual phospholipids & proteins can move freely within the layer, like it’s a liquid.
Fluid Mosaic Model… • Mosaic: because the pattern produced by the scattered protein molecules makes it look like a mosaic when viewed from above. https: //www. youtube. com/watch? v=Qqsf_UJcf. Bc
Cell Transport Notes Page: 9
Passive Transport… • Requires NO energy to move substances; down the concentration gradient. H L
H Passive Transport… L • There are 3 types of passive transport. 1) Diffusion: Movement of particles from high concentration to low concentration. H L
H Passive Transport… L 2) Osmosis: The diffusion of water through a semi-permeable membrane.
H Passive Transport… L 3) Facilitated Diffusion: The diffusion of large molecules via transport proteins from a high concentration to a low concentration.
Other Important Vocabulary Terms… • Solute: What is being dissolved. • List some of your examples… • Solvent: What is doing the dissolving. • List some of your examples… • Concentration Gradient: The difference in the concentration of a substance from one location to another. • High �� Low or Low �� High • Equilibrium/Homeostasis: The maintenance of constant internal conditions in an organism.
H Passive Transport… L 2) Osmosis: The diffusion of water through a semi-permeable membrane. • Hypertonic: “Above strength. ” There is more solute than inside cell. Movement till equilibrium is reached. Hyper is high cell shrinks • Isotonic: The concentration of water & solute are equal. No net movement. Iso is same for everything • Hypotonic: “Below strength. ” There is less solute than inside cell. Movement till equilibrium is reached. Hypo is low with a big fat O the cell is gonna swell.
Active Transport… • Requires energy to move substances; against the concentration gradient.
Test corrections • Must be in the following format to receive ½ points back. # of question and Why you picked the Answer you that answer picked May not answer guessed. There is a reason you picked that answer as opposed to another answer. Why? Correct answer Proof of correct answer May not just restate the questions, must give facts.
- Slides: 18