Physiology 2130 Lecture Notes - Lecture 3: Tonicity, Semipermeable Membrane, Red Blood Cell
1 Jan 2017
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Document Summary
Functioning of our organs and systems relies upon the complex functions of the cells. Cell organelles: golgi apparatus, responsible for packaging proteins from the rough er into membrane bound vesicles, 2 types of vesicles produced: Secretory vesicles: transport proteins to the cell membrane for release to extra-cellular environment. Will occur if increased energy demands over a period of time (muscle cells. Separates the intracellular environment from the extracellular environment. Proteins, nucleotides and other large molecules needed for the structure and function of the cell cannot penetrate this membrane. Other molecules and ions can penetrate to a degree. Selectively permeable: two-way traffic for nutrients and waste needed to sustain metabolism while it prevents the passage of other substances between the intracellular and the extracellular compartments. Made up of proteins that form channels and pores, carbohydrate molecules for cell recognition and cholesterol for stability. Made of a phosphate head (hydrophilic) and fatty acid tail (hydrophobic)
