Physiology chapter 2-Overview of membrane transport Flashcards

1
Q

What does permeable mean?

A

If a substance can cross the membrane, the membrane is said to be permeable to it.

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2
Q

What does impermeable mean?

A

If a substance cannot cross the membrane, the membrane is termed impermeable to it.

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3
Q

Describe the plasma membrane.

A

Made up of phospholipids in a lipid bi-layer, hydrophobic lipids are sequestered inside, some transmembrane proteins are embedded. It is selectively permeable.

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4
Q

What two properties influence whether a molecule can permeate the plasma membrane?

A

The relative solubility of the particle in a lipid and the size of the particle.

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5
Q

How do certain molecules enter if not through the plasma membrane?

A

Protein channels and carriers.

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6
Q

Which two general types of forces are involved in transport across the membrane?

A

Passive forces and active forces.

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