Professor Rhodus Is Lecturing About Selective Permeability of Neurons

question 17

Multiple Choice

 Professor Rhodus is lecturing about selective permeability of neurons. What would he tell the class?

• A) All ions can only travel in one direction across the membrane.
• B) All molecules must cross the membrane via a designated channel.
• C) Only certain molecules can cross the membrane freely.
• D) Only sodium and potassium ions can cross the membrane.

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Definitions:

Axon

Main central process of a neuron that normally conducts action potentials away from the neuron cell body.

Node of Ranvier

Gaps in the myelin sheath of nerve fibers where action potentials are generated, aiding in the rapid transmission of nerve impulses.

Dendrites

Extensions of neurons that receive signals from other neurons or sensory stimuli and convey them toward the cell body.

Chemical Synapse

A type of synapse at which a chemical (neurotransmitter) is released from the axon terminal of a neuron into the synaptic cleft between neurons, facilitating neural communication.