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Neurons and Nervous System Quiz

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Questions and Answers

What is the main driving force for the diffusion of ions through ion channels?

Semipermeability of the cell membrane

Sodium-potassium pump

Concentration gradient (correct)

Electrical gradient

What process actively pumps out sodium from the cell?

Electrostatic force

Diffusion

Nuclear fusion

Sodium-potassium pump (correct)

What occurs during depolarization of the cell membrane?

Hyperpolarization

Anions going out

Voltage gated potassium channels opening

Cations going in (correct)

What happens when the threshold is met at the axon hillock?

Voltage gated Na+ channels open up and sodium enters the cell Signup and view all the answers

How is information encoded by the nervous system?

Changes in pattern frequency Signup and view all the answers

What is behavior defined as in the context of the nervous system?

The actions/reactions/responses Signup and view all the answers

What are the two main types of cells within the brain?

Neurons and Glia Signup and view all the answers

What is the function of an oligodendrocyte or Schwann cell?

Speed up signal transmission with the myelin sheath Signup and view all the answers

What is the main function of an interneuron in the nervous system?

Transmit information between neurons within the CNS and coordinate outputs Signup and view all the answers

What is the primary function of astrocytes in the nervous system?

Mechanical and metabolic support Signup and view all the answers

Which type of neuron has multiple dendrites and a single neuron?

Multipolar neuron Signup and view all the answers

What is the function of microglia in the nervous system?

Phagocytosis Signup and view all the answers

What is the role of satellite cells in the nervous system?

Support groups of cell bodies of neurons within ganglia of the PNS Signup and view all the answers

What is the main function of neurilemma?

Potential regeneration of damaged axons Signup and view all the answers

What is one major difference between sensory afferent neurons and association interneurons?

Sensory afferent neurons transmit information from receptors of PNS towards CNS while association interneurons transmit information between neurons within CNS Signup and view all the answers