Nervous System Quiz

Which of the following is considered the functional unit of the nervous system? (KPI 7.1.1)

• Melanocytes

• Glial cells

• Lymphocytes

• Neurons

Which of the following parts of the neuron contains the nucleus? (KPI 7.1.2)

• 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? (KPI 7.1.2)

• 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? (KPI 7.1.3)

• E→B→A

• B→D→E

• B→A→E

• A→D→B

Neuron 2 is most likely to be a(n)_________________. (KPI 7.1.4)

• 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? (KPI 7.1.4)

• 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? (KPI 7.1.5)

• 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? (KPI 7.1.5)

• 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? (KPI 7.1.6)

• 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? (KPI 7.1.7)

• 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