zoolfun - module 14 - nervous system

What are the two main cells that populate the nervous system?

• Neurons and Glia

• Ependymal cells and Satellite cells

• Astrocytes and Microglia

• Oligodendrocytes and Schwann cells

Which part of the neuron contains the nucleus and various organelles?

• Axon hillock

• Dendrites

• Cell body

• Axon

What is the region of the cell body where the axon originates called?

• Synapse

• Axon hillock

• Dendrites

• Synaptic terminal

Which function of the nervous system involves communicating information about the external and internal environments from sensory receptors to the CNS?

• Motor output

• Reflexes

• Integration

• Sensory input

What is the major source of membrane potential in a neuron at resting potential?

• Buildup of negative charge

• Efflux of K+

• Influx of Na+

• Opening of ion channels

What is the term for a massive change in membrane voltage when the membrane potential passes a certain level?

• Resting potential

• Action potential

• Depolarization

• Repolarizing phase

What is the purpose of myelin sheaths in vertebrates?

• Increase the speed of action potentials

• Generate neurotransmitters

• Maintain membrane potential

• Regulate ion channels

What is the site of contact between a synaptic terminal and a target cell called?

• Dendrite

• Synapse

• Axon hillock

• Cell body

Which neurotransmitter is involved in muscle stimulation, memory formation, and learning?

• Dopamine

• Serotonin

• Acetylcholine

• GABA

What is the term for the clustering of sensory organs at the front end of the body?

• Ganglia fusion

• Neurotransmission

• Bilateral symmetry

• Cephalization