1. Plasma Membrane
• Function – physical barrier for the cell; separates
internal and external environments; selective
permeability
• Location – surrounding the cell, outer surface
2. Nucleus
– Function – control center of the cell; contains
DNA; filled with a fluid called nucleoplasm
– Location – center of the cell
3. Nuclear Envelope
• Function – keeps nuclear contents separate from the
rest of the cell; allow for information to get into and
out of the nucleus when necessary
• Location – surrounding the nucleus
Nuclear Envelope with pores
4. Nucleolus
• Function – dense area within the nucleus; produces
ribosomal RNA
• Location – center of the nucleus
5. Mitochondria
– Function – site of cellular respiration; the transfer
of energy from organic molecules to ATP
– Location – scattered in the cytoplasm
6. Ribosomes
• Function – sites of protein synthesis
• Location – in cytoplasm and on rough endoplasmic
reticulum
7. Rough Endoplasmic Reticulum
– Function – allow for the transport of substances
throughout the cell
– Rough ER – contains ribosomes; functions in
protein synthesis
– Location – surrounding the nucleus
8. Smooth Endoplasmic Reticulum
• Function – allow for the transport of substances
throughout the cell
• Smooth ER – doesn’t have ribosomes; functions in
lipid synthesis
• Location – surrounding the Rough ER
9. Golgi Apparatus
• Function – packaging, modifying and shipping of
cellular products
• Location - in cytoplasm near endoplasmic reticulum
10. Lysosomes
– Function – break down/digest bacteria, old or
damaged organelles
– Location – scattered in the cytoplasm
11. Peroxisomes
• Function – produce hydrogen peroxide when they
break down alcohol and engulf bacteria
• Location – scattered in the cytoplasm
12. Microtubules/Microfilaments
• Function – Hollow tubes made of protein, hold
organelles in place, maintain cell shape
• Location – Radiate outward from the center called
centrosome near the nucleus
13. Cilia and Flagella
• Cilia - Short and present in large numbers
• Flagella - Long extensions of the cell, usually
one that helps with the cell moving
• Function – Assist in movement
• Location – Outside of the cell
14. Centrioles
• Function – Two short cylinders of microtubules that
organize cell division
• Location – Near the nuclear envelope
*Only in animal cells*