Forces Acting Across Membranes 1 Flashcards Preview

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Flashcards in Forces Acting Across Membranes 1 Deck (8)
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1
Q

The cell membrane is a ______ barrier.

A

Selective.

2
Q

What is the cell membrane permeable to?

A

Gases such as oxygen and nutrients and waste products.

3
Q

Are there barriers to water or ions in the cell membrane?

A

Water no, ions yes.

4
Q

Why is the difference in charge between the ICF and ECF necessary?

A

To maintain membrane potential i.e potassium is high in ICF and sodium is high in ECF.

5
Q

Why is it important that permeability can vary?

A

For cell functions like nervous impulse

6
Q

What are carrier proteins like?

A

No continuous pore, open to either ECF or ICF. Generally carry molecules which are larger than ions.

7
Q

What are channel proteins like?

A

Creates a pore through the membrane for ions to flow through. Water filled channels are always open after a signal.

8
Q

Define membrane carbohydrates.

A

Small amounts are linked to proteins and lipids as glycoproteins and glycolipids are all extracellular.