Chapter 3: Cells Part I: Differentiated Cells, Composite Cells, Cell Membrane

Cells Adult human body has __________ ______varieties of cells Cells are considered to be “_________” – different _________ and ____________

Cells vary in size and shape Red Blood Cell (RBC) 7.5 μm 1 micrometer (1μm) = 1 x10 -6 m) Human Egg Cell (Ovum) 140 μm Smooth Muscle Cell μm long Nerve Cell Can be many cm in length White Blood Cell μm

Composite Cell Generic Cell Three major parts

Fig. 3.3

Cell Membrane Surrounds the outside of the cell Many functions 1. 2.

Cell Membrane Structure Phospholipids –Hydrophilic heads- “water” exposed to –Hydrophobic tails- “oil” lipid soluble substances –Ex. water soluble substances –Ex:

Fig. 3.6

Cholesterol Cell Membrane Structure

Fig. 3.7

Cell Membrane Structure Proteins 1.Receptor proteins- 2. Integral proteins-

Fig. 3.7

Cell Membrane Structure Proteins 3. Enzymes- 4. Cellular Adhesion Molecules (CAMS)- 5. Cell Surface Proteins -

Fig. 3.7

Intercellular Junctions Individual cells vs. groups of cells Permanently connect cell membranes of groups of cells

Clinical App. 3.1: Faulty Ion Channels Ion channels Cystic Fibrosis and Cl - Channels 1. Abnormal 2. Thick mucous A. B. C. 3. Treatment: