Author: Anonymous

Activity 1:  The resting membrane potential became less negative (-70 mV to – 40 mV) with increased extracellulkar K+ because [x] K+ diffused out of the cell leaving [z] K+  inside the cell.   The following drawing may be helpful in evaluating Questions 1 and 2.

In Activity 2, which of the following was able to detect pressure?

In Activity 2, increasing the strength of the stimulus applied to the sensory receptor increased _______.

Increasing the voltage beyond the threshold stimulus voltage resulted in which of the following?

Resting membrane potential did not change with decreased extracellular Na+  because the membrane has [x] Na+ leak channels than K+ leak channels and therefore changing Na+ concentrations has [y] effect on membrane potential.

Activity 6: Multiple action potentials were generated in response to a 500 msec duration stimulus because the [a] stimulus results in stimulation during the [b]. The stimulus is [c] which is required for an action potential to be generated during the [d] phase of the action potential.

In Activity 2, which of the following responded to a chemical stimulus?  Use your data chart to answer.

Pain-sensitive neurons conduct action potentials from the skin or teeth to sites in the brain involved in pain perception. To most effectively prevent the perception of pain a dentist would inject [a] near the [b] to [c] the generation of action potentials that would send a signal to the brain.

In Activity 5, when the interval between the stimuli decreases, _______.

What type of sensory receptor would have responded to the light stimulus?