Cell+Transport

=Cell Transport= Cell Transport is introduced in Chapter 7 which details the structure and function of the plasma membrane. In Chapter 8, Section 8.1, cell tranpsort is explained in much greater detail. Section 8.1 is an overview of the six types transport (3 passive and 3 active transport) and cell tonicity.

The outermost boundary of all cells, plant, animal, or other is typically bound by a semipermeable membrane. Semipermeable simply means that the cell membrane is allows to some "stuff" in or out while blocking other "stuff" from entering or leaving.

Permeability is good thing for cells. You would not want the intracellular contents (inside) of your cells to always match that of its environment (outside). As a result of permeability there is a constant need to maintain homeostasis. Our study of cell transport is a close-up view of exactly how homeostasis is maintained across the plasma membrane.

Read pages 194 to 200 and follow the directions on the graphic organizer. Once you have checked your answers on the graphic organizer, take the cell transport quiz. Once you have your graded paper back write the corrections to all the false answers.

Define concentration gradient. Describe what selective permeability means. Distinguish passive transport from active transport. Name the 6 types of cellular transport. Describe the substances transported for each type of transport.
 * Objectives:**



Throughout their lives, cells must perform homeostatsis constantly. This is true because cells encounter chemical environments that differ inside and outside the cell. There are three different environments. The study of these enivornments cells is what is called **Tonicity**. Attached are the notes from Sec 8.1 on tonicity and a practice worksheet with 12 examples.

Notes:

Actual problems:

The template:

Chapter 7 - Overview of the plasma membrane

[[image:clip_image002.gif width="546" height="209"]]
Cholesterol – prevents fatty acid chains from sticking together

The fluid mosaic model illustrates points out that phospholipid molecules move
==== ====
 * ====spin (clockwise or counterclockwise)
 * ====are not in a rigid/fixed location over time