Science Quiz 2

All of the following structures are main parts of a neuron EXCEPT the

• vacuoles

• axon

• soma

• dendrites

Which organelles contain neurotransmitters in the axon terminal of the presynaptic neuron?

• peroxisomes

• lysosomes

• vesicles

• mitochondria

Which cells are considered the immune cells of the brain?

• microglia

• ependymal cells

• oligodendrocytes

• astrocytes

What is the PRIMARY function of the meninges?

• to provide nutrients to the central nervous system

• to protect the central nervous system

• to deliver blood to the central nervous system

• to oxygenate the central nervous system

Which lobe of the cerebrum processes the sense of touch, temperature, and pain?

• the occipital lobe

• the frontal lobe

• the parietal lobe

• the temporal lobe

Which division of the nervous system is MOST specifically responsible for the "fight or flight" response?

• the somatic division

• the peripheral division

• the central division

• the sympathetic division

Which of these events occurs FIRST in a sodium- potassium pump?

• The pump is phosphorylated by ATP.

• Cytoplasmic sodium ions bind to the pump.

• The pump changes its conformation.

• Extracellular potassium ions bind to the pump.

The overshoot of an action potential occurs when the membrane potential is approximately

• -60 to -80 mV

• 0 to +20 mV

• -50 to -65 mV

• -80 to 100 mV

Which channels open when the membrane potential reaches 0 mV?

• voltage-gated sodium channels

• voltage-gated calcium channels

• sodium/potassium ion pump channels

• voltage-gated potassium channels

The action potential is initiated at the

• Schwann cells

• Nodes of Ranvier

• dendrites

• axon hillock