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Hyperpolarized membranes are [x] threshold and require a stimulus that is [y] to generate an action potential.

Activity 4: TTX blocks diffusion of [x] through [y] [z] channels.

Activity 8:  When magnesium was added to the extracellular solution, _______.

When you burn your finger on a hot stove, you fell sharp, immediate pain, which later becomes slow, throbbing pain. These two types of pain are carried by different pain neurons.  The sharp immediate pain is the result of action potentials propagated along [x], [y], Type [z] fiber neurons, while the slow, throbbing pain is transmitted via [a], [b], Type [c] neurons.

The release of neurotransmitter occurs _______.

How does the degree of mylenation affect conduction velocity?

In Activity 3, a weak, subthreshold stimulus will result in _______.

An action potential is an “all or none” event.  What is meant by the phrase?  Use the data in your chart to support your explanation.  Be specific and be brief. 

The electrochemical gradient is a combination of an ion’s concentration gradient and ____.

If a graded receptor potential made the resting membrane potential of the axon more negative (for example from -70 mV to -74 mV), one would expect: