On back of today's white paper copy these definitions

1. microvilli - small fingerlike extensions on the top surface of the cell membrane to increase the absorptive surface area (in intestines.)

2. tight junctions - (like rivets in sheet metal) makes a watertight connection near the surface to prevent bacteria and protista from sneaking between the cells and entering our blood.

3. button desmosomes - like two protein plates inside adjacent cells that work like buttons on both sides to hold the cell membranes together. (like cufflinks)

4. hemidesmosome - "half button" only one protein plate inside the cell holding the bottom cell membrane to the underlying basement membrane.

5. gap junction - like protein straws that connect between two cell membranes to allow passage of cytosol and nutrients and electrical stimulus.