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1 Gateway to the Cell. 2 Protective barrier Regulate transport in & out of cell (selectively permeable) Regulate transport in & out of cell (selectively.

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Presentation on theme: "1 Gateway to the Cell. 2 Protective barrier Regulate transport in & out of cell (selectively permeable) Regulate transport in & out of cell (selectively."— Presentation transcript:

1 1 Gateway to the Cell

2 2 Protective barrier Regulate transport in & out of cell (selectively permeable) Regulate transport in & out of cell (selectively permeable) Allow cell recognition Allow cell recognition Provide anchoring sites for filaments of cytoskeleton Provide anchoring sites for filaments of cytoskeleton

3 Balanced internal condition of cells Also called equilibrium Maintained by cell membrane controlling what enters & leaves the cell 3

4 4

5 5 Cell Membrane hydrophilic Polar heads are hydrophilic water loving hydrophobic Nonpolar tails are hydrophobic water fearing Makes membrane Selective in what crosses Hydrophobic molecules pass easily; hydrophilic DO NOT

6 6

7 PASSIVE TRANSPORT ACTIVE TRANSPORT Does not require energy. Move particles from an area of high concentration to an area of low concentration Examples: osmosis and diffusion Requires Energy Moves particles from an area of low concentration to an area of high concentration Examples:endocytosis and exocytosis

8 Movement of particles from an area of high concentration to an area of low concentration 8

9 9 Cell membrane Solute moves DOWN concentration gradient (HIGH to LOW)

10 copyright cmassengale10 Molecules will randomly move through the pores in Channel Proteins.

11 Diffusion of water across a membrane Diffusion of water across a membrane Moves from HIGH water potential to LOW water potential Moves from HIGH water potential to LOW water potential 11 Diffusion across a membrane Semipermeable membrane

12 Exocytosis - moving large things out Endocytosis - Moving large things in Pinocytosis- Drinking of the cell Phagocytosis - Eating of the cell 12

13 13 Pinocytosis -Takes in dissolved molecules as a vesicle -Takes in dissolved molecules as a vesicle. Cell Drinking

14 14 Endocytosis – Phagocytosis Used to engulf large particles such as food, bacteria, etc. into vesicles Called Cell Eating

15 15 Phagocytosis About to Occur

16 16 Phagocytosis Phagocytosis - Capture of a Yeast Cell by Membrane Extensions of an Immune System Cell

17 17 Exocytosis The opposite of endocytosis is exocytosis. Large molecules that are manufactured in the cell are released through the cell membrane. Inside Cell Cell environment

18 18 Moving the Big Stuff Molecules are moved out of the cell by vesicles that fuse with the plasma membrane. Exocytosis Exocytosis - moving things out. This is how many hormones are secreted and how nerve cells communicate with one another This is how many hormones are secreted and how nerve cells communicate with one another.

19 19 CELL 10% NaCL 90% H 2 O 10% NaCL 90% H 2 O What is the direction of water movement? The cell is at _______________. equilibrium ENVIRONMENT NO NET MOVEMENT

20 20 CELL 10% NaCL 90% H 2 O 20% NaCL 80% H 2 O What is the direction of water movement?

21 21 CELL 15% NaCL 85% H 2 O 5% NaCL 95% H 2 O What is the direction of water movement? ENVIRONMENT

22 22

23 23 Isotonic Solution NO NET MOVEMENT OF H 2 O (equal amounts entering & leaving) Hypotonic Solution Hypertonic Solution

24 24 Isotonic Hypotonic Hypertonic

25 25 hypotonichypertonic isotonic hypertonicisotonic hypotonic

26 26 Transport Across the Membrane

27 27 Passive Transport Facilitated diffusion Doesnt require energy Uses transport proteins to move high to low concentration Examples: Glucose or amino acids moving from blood into a cell.

28 28 Active Transport Requires energy or ATP Moves materials from LOW to HIGH concentration AGAINST concentration gradient


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