NATS 1675 Lecture Notes - Lecture 17: Membrane Transport Protein, Active Transport, Fetus
4 Aug 2015
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Document Summary
Selective transport through a membrane to either produce a channel through the membrane or act like a revolving door. Depends on what genes are active in that cell. Every cell has the same code but differentiation activates certain genes. Every cell has the same genetic code although not all genetic material is being utilized by the cell. Cells are selective in which genes are activated. Particularly important when talking to hormones certain tissues respond to different hormones. In the placenta, certain substances pas through the placenta really easily such as alcohol or small molecules (by diffusion) The placenta can also obtain and transport to the mother"s body compounds in much higher concentration or in much greater rates than diffusion. Selective movement through the membrane means that we can transport a larger amount of something against the concentration gradient - we can transport more of what is needed by the fetus. Channels through thee membrane that established diffusion more rapidly.
