BI110 Lecture Notes - Membrane Transport Protein, Cell Membrane, Blood Cell
Document Summary
They are the channel protein that allows the diffusion of water across the membrane. Water moves away from- hypotonic (lower concentration of solute) Water moves towards hypertonic ( higher concentration of solute) Hypotonic condition- lower concentration , moves to hypertonic- bag starts to swell. Hypotonic condition higher concentration, start losing the water, bag starts to shrink. Isotonic condition- no concentration, bag is normal. (^^^) another ex. Atp is needed in order to achieve the transport. Needs energy to move substance against their concentration gradient. Depends on membrane transport proteins: specific, can be saturated (^^) ex. H: cells out of the cells, cells lining stomach. Ca2+ pump: maintain low intracellular ca2+ concentration. And na+ k+ are primarily responsible to generate these changes. Secondary active transport: transport protein itself does not use atp. Gradient that uses to transfer needs primary active transport. Using atp indirectly- transfer is always coupled with transport of. Transporting itself is a hydrolysing atp something else.