A&P Chapter 3 Flashcards Preview

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Flashcards in A&P Chapter 3 Deck (12)
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1
Q

Cell membrane/ plasma membrane

A

Separates cytoplasm from the extracellular fluid.

2
Q

Function of cell membrane

A
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.
3
Q

Cell membrane

A

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

Is a barrier, but nutrients must get in.

Products and wastes must get out.

4
Q

Phospholipid bilayer

A

Double layer of phospholipid molecules.

5
Q

Hydrophilic heads

A

Towards watery enviroment in both sides

6
Q

Hydrophobic fatty acid tails

A

Inside membrane

7
Q

Permeability

A

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

8
Q

Plasma membrane

A

Is selectively permeable

Allows some material to move freely but restricts other materials.

9
Q

Selective permeable

A

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

10
Q

Simple diffusion

A

From high to,low concentration

Dissolved gases like oxygen and carbon dioxide.

11
Q

Facilitated diffusion

A

Movement across protein pores

Ex: glucose

12
Q

Osmosis

A

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.