{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lab 3_Cell Physiology_student

Lab 3_Cell Physiology_student - Ch 3 Cell physiology LAB 3...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Ch 3. Cell physiology
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
LAB 3 – Cell Physiology Eukaryotic cellular membranes are fluid mosaics of lipids and proteins Membrane structure results in selective permeability Transport: Passive (simple diffusion, facilitated diffusion, osmosis) Active (ATP-driven , e.g. Na + -K + pump) Bulk (endo- and exocytosis) Phospholipid bilayer Hydrophilic region of protein Hydrophobic region of protein Hydrophilic region of protein
Image of page 2
Passive Transport Through the Cell Membrane DIFUSSION : movement of molecules from an area of high concentration to an area of low concentration (eg. Simple diffusion of oxygen across lipid bilayer) Rate of diffusion across the membrane depends on size and polarity of molecules. Facilitated diffusion : diffusion with the help of a transport protein (a. channel proteins and b. carrier proteins OSMOSIS: diffusion of water (small, polar molecule) across a selectively permeable membrane Aquaporins : water channel proteins
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Tonicity Tonicity : a measure of osmotic pressure
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern