How Far Away on Average Is the Earth from the Sun

question 47

Multiple Choice

How far away on average is the Earth from the Sun?

• A) 8.3 million kilometers
• B) 45 million kilometers
• C) 93 million kilometers
• D) 150 million kilometers

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Definitions:

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.

Dendrites

Branch-like extensions of neurons that receive electrochemical signals from other neurons.