A&P Chapter 3

Question 1

Cell membrane/ plasma membrane

Answer 1

Separates cytoplasm from the extracellular fluid.

Question 2

Function of cell membrane

Answer 2

Physical protection
Barrier
Regulates exchange with environments
Ions and nutrients enter
Wastes eliminated and cellular products released 
Monitor the enviroment 
Extracellular fluid composition
Chemical signals
Structural support
Anchors cells and tissues.

Question 3

Cell membrane

Answer 3

The cell membrane contains lipids, carbohydrates, and functional proteins.

Is a barrier, but nutrients must get in.

Products and wastes must get out.

Question 4

Phospholipid bilayer

Answer 4

Double layer of phospholipid molecules.

Question 5

Hydrophilic heads

Answer 5

Towards watery enviroment in both sides

Question 6

Hydrophobic fatty acid tails

Answer 6

Inside membrane

Question 7

Permeability

Answer 7

Determines what moves in and out of the cell

Lets nothing in or out is impermeable

Lets anything in or out is freely permeable

Restrict movement is selectively permeable

Question 8

Plasma membrane

Answer 8

Is selectively permeable

Allows some material to move freely but restricts other materials.

Question 9

Selective permeable

Answer 9

Restricts materials based on: size, molecular space, and lipid solubility.

Question 10

Simple diffusion

Answer 10

From high to,low concentration

Dissolved gases like oxygen and carbon dioxide.

Question 11

Facilitated diffusion

Answer 11

Movement across protein pores

Ex: glucose

Question 12

Osmosis

Answer 12

Is the diffusion of water across the cell membrane

• more solutes molecules, lower concentration of water molecules.
• membrane must be freely permeable to water and selectively permeable to solutes.
• water molecules diffuse across membrane toward solution with more solutes.
• volume increase on the side with more solutes.