Human Physiology, 14th edition (2016)

The Nervous System 205

Use the figure below (from figure 7.34 ) to answer questions
38–40:

–85mV

• 55mV


• 70mV

Inhibitory

neurotransmitter

from neuron 1 Excitatory

neurotransmitter

from neuron 2

IPSP

EPSP

1

2

Threshold for action potential

38. What is the approximate magnitude of the IPSP (how
    many mV)?


39. What is the approximate magnitude of the EPSP (how
    many mV)?


40. If the IPSP had not occurred, what would be the difference
    between the EPSP and the threshold required to produce an
    action potential?

ONLINE STUDY TOOLS