Nervous System Quiz

Which of the following is considered the functional unit of the nervous system?

• Melanocytes

• Glial cells

• Lymphocytes

• Neurons

Which of the following parts of the neuron contains the nucleus?

• Axon

• Axon endings

• Cell body

• Dendrites

Based on the diagram below, which of the following is a correct match between the number and the name of the part?

• 1: Axon terminal

• 2: Nucleus

• 3: Axon

• 4: Dendrites

Which of the following shows the correct sequence for the flow of impulse through neuron number 3?

• E→B→A

• B→D→E

• B→A→E

• A→D→B

Neuron 2 is most likely to be a(n)_________________.

• interneuron

• efferent neuron

• motor neuron

• sensory neuron

Which type(s) of neurons is/are likely to have axons throughout the body and not only in the central nervous system?

• 1 only

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Which of the following best describes the resting potential of a neuron?

• The inside of the neuron is positively charged compared to the outside

• The inside of the neuron is negatively charged compared to the outside

• The inside and outside of the neuron have the same charge

• The neuron is not active and has no charge difference

How does the sodium-potassium pump help maintain the resting potential of a neuron?

• It moves more sodium ions into the cell than potassium ions out

• It moves more potassium ions into the cell than sodium ions out

• It pumps sodium ions out and potassium ions into the cell, keeping the inside negatively charged

• It allows ions to move freely in and out of the cell without using energy

What is the role of the threshold in the transmission of a nerve impulse through a neuron?

• It prevents any electrical signals from traveling through the neuron

• It determines if the stimulus is strong enough to trigger an action potential

• It allows ions to move freely in and out of the neuron at all times

• It keeps the neuron permanently at resting potential

What can be concluded about the speed of conduction between myelinated and unmyelinated fibers with varying fiber diameters in the graph below?

• As the diameter and myelination of the fiber increases, the speed of conduction increases

• Conduction along unmyelinated fibers increases more rapidly than myelinated fibers

• The diameter of the axon has no impact on conduction of myelinated/unmyelinated fibers

• The velocity of conduction increases in narrow fibers