Page 26 - The Miracle in the Cell Membrane

The Mir a cle in the Cell Mem brane

tute of Tech nol o gy (MIT), stud ied biol o gy for many
years, pub lished papers in a great many sci en tif ic jour -
nals and played a role in nucle ar research. As he writes,

The entrance to a liv ing cell is marked by pas sage through a
mem brane func tion ing to keep the bad stuff out, while let ting
the good stuff in, and expel ling what needs to be expelled,
waste pro ducts and man u fac tured goods. But who or what
decides what comes in and what goes out?

A myr i ad of por tals pro vide entry, but only if sig -
naled to open and allow entrance. Some of
these ports are gated or opened by

Entry to and depar ture from the cell take place
Entry to and depar ture from the cell take place
under high ly sen si tive super vi sion. The pas sage of
under high ly sen si tive super vi sion. The pas sage of
a sub stance through the cell mem brane is reg u lat ed
a sub stance through the cell mem brane is reg u lat ed

24