Neuron, Reflex Quiz

These structures bring messages toward the cell body. What are they?

• dendrites

• axons

• sheath cells

• telodendria

All the structures labeled with blue arrows are part of a motor unit which includes

• part of the parasympathetic nervous system

• the telodendria of a motor neuron and all the muscle cells it innervates

• skeletal muscle cells and the neuron they stimulate

• muscles cells and the connective tissue tendon

This insulating material forms a layer, around the axon of a neuron.  It enables electrical signals to travel down the axon at higher speeds.

• neuron
• myelin sheath
• dendrite
• neurotransmitter

A nerve impulse is also known as a(n)

• action potential

• resting potential

• membrane potential

• synapse

What is the structure that contains the part of the neuron that passes the nerve impulse, or AP, to the next cell, indicated by the blue circle?

• Myelin Sheath

• Axon

• Axon Terminal or telodendrite

• Dendrite

What is the function of the structure labeled with the red arrow?

• it insulates the electrical message traveling along the neuron

• it helps hold the neurons close to the blood supply

• it helps prevent bacteria and infectious organisms from getting into the axon

• it contains the neurotransmitters used to pass messages to the next cell

Which of the following would not be a function of the structure labeled with a blue circle?

• collect messages received by the dendrites

• initiate thoughts or messages when located in the gray matter

• contain organelles that carry out cell functions

• undergo mitosis for repair and growth

Words describing messages that are going toward the Central Nervous System include all but

• Sensory Neurons

• Afferent Neurons

• Efferent Neurons

• All of these are going toward the CNS

This part of the nervous system regulates involuntary or automatic actions such as heart function, blood pressure, breathing, digestion.

• Autonomic Nervous System

• Sensory Nervous System

• Motor Nervous System

• Peripheral Nervous System

This nervous system branch causes increases in heart rate and breathing among other effects known as the fight or flight response.

• Sympathetic

• Parasympathetic

• Motor

• Sensory