Cellular Transport Mechanisms (Exam 1) Flashcards Preview

Spring of 2012 > Cellular Transport Mechanisms (Exam 1) > Flashcards

Flashcards in Cellular Transport Mechanisms (Exam 1) Deck (13)
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0
Q

Simple diffusion

A

Result of the constant random motion of all atoms and molecules in a solution

Rate of diffusion increases as temperature increases
Rate of diffusion decreases as molecule size increases

1
Q

Passive transport

A

Doesn’t require energy (ATP)

Movement of salutes down the concentration gradient

2
Q

Facilitated diffusion

A

The diffusing surface binds with a carrier protein on either side of the plasma membrane

3
Q

Osmosis

A

The movement of water and area where there are less solutes to an area where there are more solutes

4
Q

Hypertonic solution

A

The solution with more solutes

5
Q

Hypotonic solution

A

The solution with less solutes

6
Q

Important facts

A

Water will always move from hypo to hyper
Shrink=crenate
Burst=Lysenko

7
Q

Active transport

A
Requires energy (ATP)
Moving solutes against the gradient
8
Q

Primary active transport

A

Na+/K+ pump
Moves sodium and potassium against their concentration gradient
More sodium in the ECF, more potassium in the ICF
3 Na move out
2 K move in

9
Q

Membrane potential

A

Generation of voltage (energy) in the form of electricity by separation of oppositely charged particles across a membrane

10
Q

Rating membrane potential

A

The charge on an excitable (nerve, muscle) cells membrane when it is inactive
Usually -90mv to -70mv
The - means the inside of the cell is more negative than the outside

At rmp the cell is said to be polarized (separation of charges exists)

11
Q

Negativity inside the cell is due to

A

At rest the membrane is more permeable to the K+ than Na+

There is a large concentration of intracellular negatively charged proteins that are impermeable

12
Q

Role of a Na+/K+ pump

A

Actively kick out the Na+ that has passively moved in
Actively pull in the K+ that has passively moved out

Maintains differential concentration gradients for Na+ and K+ that store energy through nerve and muscle cell function

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