Which of the Following Gives the Correct Sequence of Layers

question 32

Multiple Choice

Which of the following gives the correct sequence of layers in the mantle, from center to surface?

• A) lower mantle; upper mantle, aesthenosphere
• B) aesthenosphere, mantle, upper mantle
• C) upper mantle, aesthenosphere, mantle
• D) mantle, aesthenosphere, upper mantle

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Definitions:

Axon

A long fiber that extends from a neuron and transmits electrical impulses away from the neuron's cell body.

Myelin Sheath

A protective covering made of fatty substances that surrounds the axons of many nerve cells, aiding in the speedy transmission of electrical signals.

Synaptic Vesicles

Small sacs in the neuron that store neurotransmitters, which are released into the synaptic cleft to transmit nerve impulses to other neurons.

Axon Terminals

The distal terminations of the branches of an axon, making connections with other nerve cells or muscles and transferring the impulse.