Additional Practice

What is the difference between a protein channel moving solutes and facilitated diffusion?

Protein channels are not active (does not require ATP), but facilitated diffusion is (requires ATP)

One requires a membrane protein, the other does not

One shows ligand specificity, the other does not

Protein channels move moelcules/ligands faster than a facilitated transport system

I don't know

What is true about action potentials?

action potentials occur in the dendrites

myelination causes action potentials to propagate faster

the Na+/K+ pump is responsible for repolarization

it begins firing at -70mV

I don't know

What is true about propagation on a unmyelinated nerve?

The action potential will travel slower

the AP will not "jump" as it does in a myelinated axon

it will travel the same speed as a myelinated axon, granted its diameter is smaller.

A and B are correct

A,B and C are correct

I don't know

If a cell has an osmolarity of 300osm/L, which of the following solutions would cause it to shrivel?