The cell/The plasma membrane (ORAL SCIENCE)

Question 1

What is the Plasma membrane

Answer 1

The outer covering of the cell (contains cell within)

Question 2

What is the main roles of the Plasma membrane

Answer 2

• Separates cells from other cells. (semi permeable barrier)
  
  • Controls movements of substances
  • Protects the cells
• Communication ( to external environment )

Question 3

What is the cytoplasm

Answer 3

Cytoplasm ( contains all organelles and gel like substance)
- cytosol ( gel like substance surrounding organelles )
1. Cytosol - ICF 55%, 75% - 90% ( fluid )

Question 4

Difference Intercellular fluid and Intercellular fluid

Answer 4

Intercellular fluid - in the cell
Intercellular fluid - in-between cells

Question 5

Plasma membrane structure

Answer 5

• The fluid mosaic model describes the arrangement of molecules within the membrane
  
  • Made up of phospholipids (bi-layer)
  • Heads from the boundary ( tails face each other)
    Lipid bilayer – Phospholipids

Question 6

Tails are —-
Heads are—–

Answer 6

Tails are hydrophobic
Heads are Hydrophilic

Question 7

What can diffuse through the plasma membrane

Answer 7

Semi permeable: water, gasses, small fat molecules - pass easily
Large molecules (proteins) - don’t pass
Charged molecules ( Na+, K+, Cl- etc) - pass through channels