PPT-The Cell Membrane

Homeostasis amp Cellular Transport Function of the Cell Membrane Cell membrane separates the components of a cell from its environment surrounds the cell Gatekeeper of the cellregulates the flow of materials into and out of cell. . By Dr. . Vani. Gupta. 2. “Polarity” . of the . membrane. Na. +. K. +. Mg. 2+. Ca. 2+. H. +. HCO. 3. -. Cl. -. SO. 4. 2-. PO. 3. -. protein. inside. (in mM). 14. 140. 0.5. 10. -4. (pH 7.2). 10. -. Gateway to the Cell. 2. Photograph of a Cell Membrane. 3. Cell Membrane. The cell membrane is . flexible. and allows a . unicellular. organism to . move. 4. Homeostasis. Balanced. internal condition of cells. . By Dr. . Vani. Gupta. 2. “Polarity” . of the . membrane. Na. +. K. +. Mg. 2+. Ca. 2+. H. +. HCO. 3. -. Cl. -. SO. 4. 2-. PO. 3. -. protein. inside. (in mM). 14. 140. 0.5. 10. -4. (pH 7.2). 10. and Transport. Cell Membrane. Cell membrane- also called the . Plasma Membrane. Separates the cell from its surrounding . environment.  . Helps maintain homeostasis which is keeping the internal conditions constant. Summary. How do materials get across a cell's membrane. ?. It depends on the type of substance. Summary. Non-polar materials or hydrophobic materials . do. cross easily, especially if small. Ex – CO. Group 2- Cell Development. Gladys Alexandre, Cristina Calestani, John Koontz, Silvia Moreno, Brian Ring, William Said. Context: Principles of Biology I (BIOL 1107); >250 students (freshman level). “Head” regions of phospholipids are hydrophilic, so love water. “Tail” regions are hydrophobic, so fear water and “hide” from it. In other words, cells membranes form in water because they HAVE to!. . “ Life is a . dynamic equilibrium of hundreds and thousands and millions of chemical and biochemical reactions going on between non-living substances at ionic and molecular level”.. . -. Panday. Figure 4.13c. Figure 4.13b–c. Gram-Positive Gram-Negative . Cell Walls Cell Walls. Thick peptidoglycan. Teichoic acids. In acid-fast cells, contains mycolic acid. Thin peptidoglycan. No teichoic acids. What is the plasma membrane?. A flexible boundary between the cell and its environment which maintains . HOMEOSTASIS. within the cell. **Remember that . HOMEOSTASIS. is a state of balance/equilibrium within the cell.. organelles. . .  . A. The cell membrane provides . protection. and support for the . . cell. . Animal . cells . do not have a cell wall, therefore, the cell . membrane . must provide . primarily . of ______.. DNA. Protein. Carbohydrates. Phospholipids. 2. The . phospholipids in the cell membrane are arranged in a bilayer (double layer). How are the phospholipid molecules arranged in this bilayer?. Much larger than prokaryotic cells having two enveloped systems. True cells occurring in plants and animals . Though they have different shape size and physiology but all cells are typically composed of plasma membrane cytoplasm and its organelles i.e. mitochondria, endoplasmic reticulum . Lec3/cytology . 2021-2022. By: . MSc. . Farah E. . Ismaeel. Objectives of this lecture. Learn about . . cell . membrane . permeability. . . Learn . about . the ways of molecules transport via cell membrane. .