Unit 12 intro to nervous system PDF

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Lab Assignment...

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Name Section

Date

UNIT

12 REVIEW

Check Your Recall 1

Label the following structures on Figure 12.9. ❑ Axon ❑ Axon collateral ❑ Axon hillock

Nissl bodies

❑ Cell body ❑ Dendrites ❑ Neurofibrils

❑ Nissl bodies ❑ Telodendria

Axon collateral Neurofibr ils Axon Axon hillock

Telodendria

Cell body Dendrites FIGURE

2

12.9

Neuron.

The neuron pictured in Figure 12.9 is a a. pseudounipolar neuron. b. bipolar neuron. c. multipolar neuron. d. unipolar neuron.

Introduction to the Nervous System ❘

UNIT

12 ❙ 5

3

The main function of an axon is to a. generate EPSPs or IPSPs when neurotransmitters bind their membranes. b. generate and transmit signals in the form of action potentials. c. function as the biosynthetic center of the neuron. d. form the myelin sheath.

4

Where are synaptic vesicles located? a. Axon terminals. b. Dendrites. c. Cell body. d. Both a and b are correct. e. All of the above.

5

Matching: Match the neuroglial cell with its correct function.

6

__F__ Oligodendrocytes

A. Create the myelin sheath in the PNS

__D__ Astrocytes

B. Ciliated cells in the CNS that form and circulate cerebrospinal fluid

__E__ Microglial cells

C. Surround the cell bodies of neurons in the PNS

__A__ Schwann cells

D. Anchor neurons and blood vessels, maintain extracellular environment around neurons, assist in the formation of the blood-brain barrier

__C__ Satellite cells

E. Phagocytic cells of the CNS

__B__ Ependymal cells

F. Form the myelin sheath in the CNS

Label the following structures on Figure 12.10. ❑ Internode ❑ Myelin

❑ Neurilemma ❑ Node of Ranvier

❑ Oligodendrocyte ❑ Schwann cell

Oligodendrocyte Schwann cell

Internode Myelin Node of Ranvier

Neurilemma

FIGURE

12.10

Myelin sheath.

Introduction to the Nervous System ❘

UNIT

12 ❙ 6

7

Label the following structures on Figure 12.11. ❑ Axon terminal of presynaptic neuron ❑ Neurotransmitter receptors

❑ Neurotransmitters ❑ Postsynaptic neuron ❑ Synaptic cleft

Synapt ic vesicle

❑ Synaptic vesicles ❑ Voltage-gated Ca2! channel

Voltage-gated calcium ion channel

Neur otransmitters

Axon terminal of presynaptic neuron

Synaptic cleft Neur otransmitter receptor Postsynaptic neuron

FIGURE

12.11

Structure of a neuronal synapse.

8

An action potential is generated at the a. trigger zone of the axon. b. postsynaptic membrane. c. cell body. d. axon terminal.

9

What is the difference between an excitatory postsynaptic potential and an inhibitory postsynaptic potential?

An excitatory postsynaptic potential creates a local depolarization in the membrane of the postsynaptic neuron that brings it closer to threshold. An inhibitor postsynaptic potential does the opposite; it hyperpolarizes the membrane and brings it farther away from threshold.

10

What triggers exocytosis of synaptic vesicles? a. Arrival of a local potential at the cell body. b. Hyperpolarization of the postsynaptic membrane. c. Neurotransmitters binding to the postsynaptic membrane. d. The influx of calcium ions into the axon terminal.

Introduction to the Nervous System ❘

UNIT

12 ❙ 7...