Membrane Transport Department of Biology, WCU.

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Presentation transcript:

Membrane Transport Department of Biology, WCU

Introduction Environments Fluid movement Processes Intra-, intercellular, extracellular - interstitial fluid Fluid movement Processes passive active

Diffusion 1. Simple Transport movement from high to low concentration (e.g. food dye) Transport lipid soluble lipid insoluble

Diffusion 2. Osmosis diffusion through a semi-permeable membrane

Osmosis video

Diffusion 2. Osmosis Osmolarity (mOsm) Water tension called tonicity

Diffusion Importance

Diffusion 3. Facilitated Requires a protein carrier (glucose) Confirmational shape change

Active transport Requires carrier proteins Against concentration gradient Requires ATP Types symport antiport (Na+K + ATPase pump)

Active transport Na+/K+ pump

Bulk transport Large molecules Requires ATP (protein from Golgi) Types exocytosis endocytosis

Exocytosis e.g. hormones, mucus (goblet cells), wastes (dead cells) Encapsulated in vesicle

Endocytosis e.g. white blood cell engulf bacteria Types phagocytosis

Endocytosis Types Pinocytosis

Endocytosis Types receptor-mediated endocytosis (insulin)