Membrane transport Xia Qiang, PhD Department of physiology Zhejiang University School of Medicine Tel:88206417,88208252 Email:xiaqiang@zju.edu.cn
Membrane Transport Xia Qiang, PhD Department of Physiology Zhejiang University School of Medicine Tel: 88206417, 88208252 Email: xiaqiang@zju.edu.cn
LEARNING OBJECTIVES Describe how solutes cross cell membranes Explain how charge size and solubility affect solute movement across cell membranes Contrast how transporters, pumps channels work Describe how ion channels are gated Describe how epithelial transport works
LEARNING OBJECTIVES • Describe how solutes cross cell membranes • Explain how charge, size, and solubility affect solute movement across cell membranes • Contrast how transporters, pumps & channels work • Describe how ion channels are gated • Describe how epithelial transport works
opyright e The McGraw-Hill Companies, Ine. Permission roquirod for reproduction or display. Nucleus Nucleolus Plasma membrane endoplasmic reticulum Bound ribosomes Fre endoplasmic Microfilaments Microtubule Organelles have their own membranes
Organelles have their own membranes
Cell Membrane (plasma membrane) Copy right g The McGraw-Hill Companies, Inc. Permission required for reproduct on or display. TABLE 3-1 Functions of Cell Membranes 1. Regulate the passage of substances into and out of cells and between cell organelles and cytosol 2. Detect chemical messengers arriving at the cell surface 3. Link adjacent cells together by membrane junctions 4. Anchor cells to the extracellular matrix
Cell Membrane (plasma membrane)
Membrane Transport Simple diffusion(单纯扩散) Facilitated Diffusion(易化扩散) Active Transport(主动转运) Endocytosis and exocytosis(出胞与入胞)
Membrane Transport ▫ Simple Diffusion（单纯扩散） ▫ Facilitated Diffusion（易化扩散） ▫ Active Transport（主动转运） ▫ Endocytosis and Exocytosis（出胞与入胞）