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THE CELL MEMBRANE

Honors Biology Kathy Gabric & Steve Moore 2002

THE CELL Current investigations of the cell’s organelles—the nucleus, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, mitochondria, and cytoskeleton--hold great promise for the solution of problems in basic biology and clinical medicine.  However, the key that may unlock the greatest number of health benefits may well be found in the cell’s filmy membranes, particularly the surface membrane, which plays a pivotal role in maintaining the integrity of the cell and, in a larger way, in protecting the health of the organism.

CELL MEMBRANES

CELL MEMBRANES

CELL MEMBRANE Yet despite its barrier functions, the cell membrane—which is often less than 0.01 micrometer thick—is not impassive.  Rather, it is exquisitely sensitive to its surroundings and selectively allows certain substances to enter and leave the cell while barring others.

CELL MEMBRANES It takes in nutrients & excretes wastes.  It sends and receives chemical and electrical messages, including signals for the cell to manufacture proteins or to divide.  In multicellular organisms, it joins with other cells to form tissues.

CELL MEMBRANES All membranes are composed of 2 basic kinds of molecules—proteins and lipids.

Cell Membrane

Cell Membrane

Cell Membrane

Cell Membrane

Cell Membrane

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Cell Recognition Proteins

There are carrier & channel proteins that regulate transport and diffusion

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Carrier Protein

Coupled Channels

Carrier Protein

Channel Protein

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Receptor Protein

Receptor Protein

Receptor Protein

Enzymatic Protein

Cell Membrane

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