Lecture 6 Graded Potentials

Question 1

Review the structures of a neuron and identify their role in transmission of a the synaptic information

Answer 1

1. Understand the AP reaches the pre synaptic terminal leading to NT release
2. Integration of post synaptic potentials at initial segments of axon triggers action potential

Question 2

Explain the role of permeably in controlling graded and action potentials

Answer 2

Neural communication is based on rapid change in membrane permeability

2nd messengers would be too slow.

Question 3

Describe the characteristic, permeability changes and ionic basis of graded potentials and AP

Answer 3

Depolarization= less negative
Repolarization = return to negative state
HyperPol = More negative

Question 4

Describe the process of summation of graded potentials

Answer 4

When one neuron receives input from many ESPS of other neurons simultaneously

Question 5

Describe the process of temporal summation

Answer 5

When a single Synapse receives many EPSP from many presynaptic cells

Question 6

EPSP

Answer 6

Excitatroy postsynaptic potential

Question 7

IPSP

Answer 7

Innhibitory postsynaptic potential