​The Single Most Important Contributor to an Increase in Life

question 48

Multiple Choice

​The single most important contributor to an increase in life expectancy is

• A) ​the decrease in the infant mortality rate.
• B) ​the increase in individuals' beliefs in the importance of exercise.
• C) ​advancement in medical technology.
• D) ​advancement in medical care.

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Definitions:

Synaptic Pruning

The process by which extra neurons and synaptic connections are eliminated to increase the efficiency of neurotransmission in the brain.

Myelination

The process of developing a myelin sheath around the nerves, which significantly speeds up the transmission of nerve signals.

Vaccine-preventable Disease

Illnesses for which effective immunizations exist, allowing for their prevention through vaccination.

Synapse

The intersection or gap between the axon of one neuron and the dendrites of other neurons; the gap that neurotransmitters must cross.