Topic 6 pt 1-2

_____ has a higher concentration outside the neuron than in the cytoplasm.

• K+

• Na+

• H+

• Mg2+

What triggers the opening of voltage-gated ion channels?

• Temperature change

• Light exposure

• Change in ion gradient

• Chemical binding

The characteristic of ungated ion channels is _____

• Restricted flow of ions

• Unrestricted flow of ions

• Flow of ions only in one direction

• Flow of ions only when stimulated

_____ has a higher concentration inside the neuron than in the cytoplasm.

• Na+

• Cl-

• K+

• Ca2+

_____ is required for ions to flow into or out of a cell.

• A temperature gradient

• A pressure gradient

• A concentration gradient

• A light gradient

The main difference between gated and ungated ion channels is that gated channels can be _____ or closed.

• Gated channels are always open

• Ungated channels are always closed

• Gated channels can be opened or closed

• Ungated channels require energy to function

What is the role of the sodium/potassium pump in maintaining resting potential?

• Pumps 3 K+ in for 2 Na+ out

• Pumps 3 Na+ out for 2 K+ in

• Pumps 2 Na+ in for 3 K+ out

• Pumps 2 K+ out for 3 Na+ in

What occurs when a neuron reaches the threshold potential?

• It becomes hyperpolarized

• It fires an action potential

• It remains at rest

• It becomes more negative

An EPSP is an _____.

• Excitatory post-synaptic potential

• Inhibitory post-synaptic potential

• Excitatory pre-synaptic potential

• Inhibitory pre-synaptic potential

What type of synapse is described as an excitatory synapse?

• Synapse causing IPSP

• Synapse causing EPSP

• Synapse causing hyperpolarization

• Synapse causing resting potential