Anatomy Exam 4 Practice

A synapse is a functional junction between:

• Two neurons

• A neuron and a muscle cell

• A neuron and a glandular cell

• all of these choices

The axon hillock is the part of a neuron that

• connects the axon to the neuron cell body

• releases neurotransmitters

• is the primary site of protein synthesis

• is covered in myelin

Dendrites are processes of a neuron that:

• carry nerve impulses away for the neuron cell body

• are usually myelinated

• are usually longer than axons

• none of these choices

Which of the following neuroglia would be found in the peripheral nervous system?

• Satellite cells

• Astrocytes

• Microglia

• Oligodendrocytes

When compared to unmyelinated axons, myelinated axons:

• Are electrically insulated

• Are gray in color

• Have a faster speed of nerve impulse conduction

• Are more numerous

At a synapse between the axon of one neuron and the dendrite of another neuron, the axon would be part of a ____ neuron; the dendrite would be part of a ____ neuron.

• Presynaptic, postsynaptic

• Visceral, somatic

• Postsynaptic, presynaptic

• Somatic, visceral

A main difference between neurons (nerve cells) and neuroglia (glia) is

• Neuroglia are found only in the central nervous system

• Neurons are more numerous than neuroglia

• Mature neurons do not normally divide; neuroglia do

• Neurons are generally smaller than neuroglia

Select the best description of the microglia

• Phagocytes of the central nervous system

• Produce myelin sheaths

• form the blood-brain barrier

• generate action potentials

A neurolemma (sheath of Schwann) is a characteristic of cells located in the peripheral nervous system, but NOT in the central nervous system.

• False

• True

A typical reflex arc involves the following components:

1. 1. Sensory neuron

2. 2. Motor neuron

3. 3. Sensory receptor

4. 4. Integrating center

5. 5. Effector

• 3, 2, 1, 5

• 3, 1, 4, 2, 5

• 3, 4, 2, 5

• 3, 4, 1, 2, 5