Ch. 4-6
Endoplasmic Reticulum (ER)
"intracellular highway"
	molecules move from one part of cell to another
system of membranous tubules and sacs
amount
	fluctuates depending on cell activity
2 types of ER
	rough
		covered in ribosomes
		prominent in cells that make large amounts of proteins
	smooth
		not covered in proteins
		involved in
			synthesis of steroid
				gland cells
			regulation of calcium levels
				muscle cells
			breakdown of toxic substances
				liver cells
	may be continuous or separate






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