PSY320H1 Study Guide - Quiz Guide: Sliding Filament Theory, Neuromuscular Junction, Myosin Head

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12 Apr 2014
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The cell: stability of chemical reactions responsible for animal physiology is maintained within cells through the action of cell membranes: Electrical activity of cell membranes leads to cell-cell signaling. All animal cell are surrounded by a fluid plasma membrane: integral proteins: serve as passive transport pores and channels active-transport pumps and carriers. Membrane-associated proteins have polar and non-polar regions: non polar: domains contain amino acid with hydrophobic side chains and are buried in the lipid bilayer, polar: domains contain hydrophilic amino acid side chains and projects into aqueous media. Movement across the cellular membrane: membranes can be: Permeable: substances can move across the cell membrane (permeable, semi-permeable or selectively permeable) Impermeable: substances cannot move across the cell membrane: passage across the membrane can be: Passive: from areas of high to low concentration (gradient) Active: molecules move against the concentration gradient (fueled by energy from the hydrolysis of atp) Mechanisms for transmembrane movements: materials can cross the cell membrane by:

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