Cell membrane and membrane transport

Question 1

Cell membrane does what?

Answer 1

Covers and protects the cells cytoplasm and controls what goes in/out and connects cells to each other

Question 2

What does the cell membrane contain?

Answer 2

• phosphilipds
• proteins
• cholestrol
• glycoproteins (carb & protein)
• Glycolipids ( cab & lipid)

Question 3

What are ion channels

Answer 3

channel carriers selectively move Ions through the membrane in/out.

Question 4

how is homeostatis helped

Answer 4

via selectively permeable membrane

Question 5

Lipid solubles can..

Answer 5

freely pass through and gasses and fat soluble substances can slip through

Question 6

channel proteins..

Answer 6

allow water and ions to pass through a channel

Question 7

Passive transport

Answer 7

substances moving across cell membrane due to kinectic energy. and do bulk transport
NO ATP

Question 8

Active Transport

Answer 8

involves substances moving across membrane with the use of energy, they go across their concentration gradient.

Question 9

Simple Diffusion

Answer 9

• the movement of molecules from area of their own high concentration to an area of their own low concentration
• with or with out membrane
• they include steroids fat soluble vitamins (D, E, K,A) O2 & CO2 etc

Question 10

Osmosis

Answer 10

• movement of water through selective permeable membrane from an area of high water concentration (hypotonic) to an area of low water Concentration (Hypertonic)
• “where NA+ goes H2O follows”

Question 11

hypotonic

Answer 11

low concentration of solutes

Question 12

Hypertonic

Answer 12

higher concentration of solute.

Question 13

Facilitated Diffusion

Answer 13

• The movements of molecules across the membrane down their concentration gradient

Question 14

Protein Carriers

Answer 14

have a concentration of amino acids and they push glucose through their protein carrier

Question 15

Channel Carriers

Answer 15

• let ions or water through and have gates to let them through (H2O, NA+, K)

Question 16

Active transport

Answer 16

• is done by protein structures in the cell membrane called a ‘Pump’.
• uses ATP to push substances across the cell membrane against high concentrated substances

Question 17

Transport in vesicles

Answer 17

• a vesicle is a small membrane-bound spherical sac and is formed by budding off of the membrane

Question 18

Exocytosis

Answer 18

• vesicles fuse with plasma membrane releasing their contents out of the cell into extracellular fluid e.g. proteins synthesised in the cell packaged to leave the cell.

Question 19

Endocytosis

Answer 19

• materials move into the cell
• Pagnocytosis (particles)
• Pinocytosis ( fluid)

Question 20

Lysosome organelle

Answer 20

contains digestive enzymes