Unit 3

A student observes the structure of a neuron under the microscope. The cell has a central soma with 2 cell processes emerging, one on each side. One cell process receives input from another cell while the second cell process is responsible for generating output. What is the structural classification of this neuron?

Bipolar

How do astrocytes assist in neuronal fetal development?

By secreting chemicals that regulate neuronal connections

TRUE OR FALSE? In the CNS, oligodendrocytes secrete nerve growth factor to stimulate the regeneration of damaged axons.

False, the PNS does

TRUE OR FALSE? ganglia are clusters of neuron cell bodies located within the CNS

False. Ganglia are found in the PNS

TRUE OR FALSE? Nerve impulses relaying pain would most likely use saltatory conduction

False. Pain stimuli would most likely use continuous conduction

TRUE OR FALSE? One function of the nervous system is to always respond to sensory input

False. The CNS responds

In a nerve, groups of axons are wrapped into separate bundles called -------------.

Fascicles

Myelin sheaths mainly consists of which part of the glial cells that form them?

Plasma membranes

What does the nervous system do?

Processes and evaluates information

What is the most abundant glial cells in the CNS

astrocytes

When our esophagus contracts involuntarily to move a bolus of food down, it is acting based on which subdivision of the motor nervous system?

autonomic

The nerve impulse conduction along an unmyelinated axon is called______________conduction.

continuous

autonomic motor

innervates cardiac and smooth muscle

Somatic motor

innervates skeletal muscle

What cell secrete nerve growth factors that stimulate outgrowth of severed axons?

neurolemmocytes

Somatic Sensory

receives information from skin

visceral sensory

receives information from the skin

Electrical synapse

requires gap junctions

Another term for the ________system is the afferent nervous system.

sensory

The "voluntary" nervous system component of the motor nervous system is the _________motor subdivision.

somatic

What increases the chance of a damaged axon being able to regenerate?

some neurilemma remains

A typical synapse in the CNS consists of a presynaptic neuron and a postsynaptic neuron, separated by a narrow space called the_________________.

synaptic cleft

TRUE OR FALSE? A regenerating axon in the PNS is guided by the regeneration tube, and grows at a rate of about 5 mm per day

true

Chemical synapse

utilizes neurotransmitters