For Most of Human History,and in Developing Countries Today,the Major

question 96

Multiple Choice

For most of human history,and in developing countries today,the major source of energy has been

• A)natural gas.
• B)oil.
• C)wind.
• D)muscle power.

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Definitions:

Neurons

Specialized cells that transmit nerve impulses; the basic building blocks of the nervous system.

Dendrites

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

Synapse

The junction between two neurons, where nerve impulses are transmitted from one neuron to another.

Endorphin

Neurotransmitters found in the brain that bind to opiate receptors and produce a feeling of pain relief and well-being.