A&P I (BIOL 3320)
Nervous System Lab 5 Worksheet
Unit 12 Activity I. The Neuron. Read the information in Exercise 12-1 and label the following
structures in the image below: Soma, Axon, Axon terminals, myelin, dendrite, dendritic
branches, Node of Ranvier, telodendria
Read exercise 12-2 in your lab book and complete Procedure 2 (copied from your lab book)
below.
Neuronal action potential reaches the axon terminal of neuron 1 ➔ depolarization of the axon
terminal triggers the opening of ______________________________ion channels ➔ these ions enter the
axon terminal causing ____________________________ to diffuse to the membrane and release
________________________________ from the axon terminal by __________________________________➔
______________________________________ diffuse across the ____________________________________ and bind to
__________________________________ on the postsynaptic membrane of neuron 2, generating an excitatory
local potential ➔ if the neuron is stimulated enough times, the excitatory local potentials
______________________________ and spread through the neuron’s plasma membrane toward the axon ➔
when the trigger zone is depolarized to _______________________________________ , an
_____________________________________________ is generated.
, 6. Label the following structures on the figure below: internode, myelin, neurilemma, node of ranvier,
schwann cell, oligodendrocyte
7. Label the following structures on the figure below: presynaptic neuron, postsynaptic
neuron, neurotransmitters, receptors for neurotransmitters, synaptic vesicles, voltage gated
Ca+2 channel, synaptic cleft
Complete Check your Recall Questions 4, 5, 6 and 7.
Complete Check Your Understanding Questions 4 and 7
Nervous System Lab 5 Worksheet
Unit 12 Activity I. The Neuron. Read the information in Exercise 12-1 and label the following
structures in the image below: Soma, Axon, Axon terminals, myelin, dendrite, dendritic
branches, Node of Ranvier, telodendria
Read exercise 12-2 in your lab book and complete Procedure 2 (copied from your lab book)
below.
Neuronal action potential reaches the axon terminal of neuron 1 ➔ depolarization of the axon
terminal triggers the opening of ______________________________ion channels ➔ these ions enter the
axon terminal causing ____________________________ to diffuse to the membrane and release
________________________________ from the axon terminal by __________________________________➔
______________________________________ diffuse across the ____________________________________ and bind to
__________________________________ on the postsynaptic membrane of neuron 2, generating an excitatory
local potential ➔ if the neuron is stimulated enough times, the excitatory local potentials
______________________________ and spread through the neuron’s plasma membrane toward the axon ➔
when the trigger zone is depolarized to _______________________________________ , an
_____________________________________________ is generated.
, 6. Label the following structures on the figure below: internode, myelin, neurilemma, node of ranvier,
schwann cell, oligodendrocyte
7. Label the following structures on the figure below: presynaptic neuron, postsynaptic
neuron, neurotransmitters, receptors for neurotransmitters, synaptic vesicles, voltage gated
Ca+2 channel, synaptic cleft
Complete Check your Recall Questions 4, 5, 6 and 7.
Complete Check Your Understanding Questions 4 and 7
