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Neuroscience: Glial Cells and CNS Environment

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Neuroscience: Glial Cells and CNS Environment

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Questions and Answers

What is the primary function of ependymal cells in the CNS?

To create barriers between compartments and act as a source of neural stem cells (correct)
To take up water and neurotransmitters
To form myelin sheaths and support rapid action potential propagation
To act as scavengers and secrete neurotrophic factors

Which type of cell is responsible for taking up water, K+, and neurotransmitters?

Astrocytes (correct)
Microglia
Oligodendrocytes
Ependymal cells

What is the direction of unidirectional flow of information in a neuron?

From axon to cell body
From synapse to dendrite
From cell body to axon
From dendrite to synapse (correct)

What is the primary function of the cell membrane in relation to compartmentalization?

To act as a barrier and regulate the movement of molecules (A) Signup and view all the answers

What is the reason for the difference in the concentration of K+ and Na+ ions between the IC and EC fluids?

Because of the differential leakiness of channels (B) Signup and view all the answers

What is the term for the movement of ions through specific channels?

Leak channels (A) Signup and view all the answers

What is the term for the potential difference between the IC and EC compartments?

Resting potential (D) Signup and view all the answers

What happens to the membrane potential when K+ permeability increases?

It becomes more negative (D) Signup and view all the answers

What is the term for the local depolarisation or hyperpolarisation in response to a stimulus?

Graded potential (D) Signup and view all the answers

What is the term for the process of the return to the resting potential?

Repolarisation (A) Signup and view all the answers