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Physiology 2002 > Active Transport > Flashcards

Flashcards in Active Transport Deck (12):
1

Why is there no net movement at equilibrium?

Because there is no potential energy difference to produce movement

2

How do carriers move substances?

- When the ligand binds it causes a conformational change which moves the ligand from one side of the cell membrane to the other.

- It can do this in either direction

3

The rate of carrier-mediated diffusion is determined by?

The speed of each carrier and the number of carriers

4

Is Carrier-Mediated diffusion active transport? Why/Why not?

No, this is facilitated diffusion, the energy still comes from the concentration gradient

5

Co-transporters move _____________ in a ______ ratio

Several substances in a fixed ratio

6

Symports move substances in ___________ direction(s)

The same

7

Antiports move substances in ___________ direction(s)

Opposite directions

8

We can use __________ of one molecule to move another. i.e. ________________

Diffusion
Na-Glucose co-transporter

9

A pump uses _______ to trigger _________________. which allow movement

A pump to trigger conformational changes

10

The Na-K-ATPase pumps __ Na+ ___ and __ K+ ___

3 Na Out
2 K In

11

___________ by using ____ changes the binding affinity in pumps

Phosphorylation
ATP

12

Chemical gradients produced by a pump can be used to power movement of other substances, what is this called?

Secondary Active Transport