BIOL10800 Lecture Notes - Lecture 3: Lipid Bilayer, Membrane Transport, Symporter
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25 Oct 2016
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Two circuits in series: pulmonary and systematic: 100% of blood goes through lungs. Blood goes into right side of the heart to get oxygenated and then pumped out of left side to the body: blood goes to lungs first and then to rest of body. Cell membrane is a semi-permeable, lipid bilayer: polar head on the outer parts of the layer w/ two non-polar tails, heads are on the outside because they face the water (hydrophilic) Structure allows cell to exist in the form it does. Small non-polar substance can diffuse through bilayer: co2 and o2. Larger, charged + polar substance require facilitation to cross the membrane: na+ Channels are used extensively for transport of ions such as na, k, ca. Ion channels are: specific (calcium ion channel would not let other ions through, gated. Many kinds of carriers (protects ion from the things in membrane that would normally repel it: uniporters, antiporters, symporters.
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