During Adulthood, What Happens to the Body's Ability to Take

question 27

Multiple Choice

During adulthood, what happens to the body's ability to take in and transport oxygen to various body organs (VO₂ max) ?

• A) When measured at rest, VO₂ max minimally declines with age, but during exercise, there is systematic decline of VO₂ max beginning between ages 35 and 40.
• B) When VO₂ max is measured at rest, there is a systematic decline of about 1% per year, but during exercise there is minimal decline in capacity.
• C) Primary aging causes an increase in VO₂ max during both rest and exercise, although the greatest increases are found during exercise conditions.
• D) As women age, their VO₂ max decreases during rest and exercise conditions, but as men age, their VO₂ max improves under rest and exercise conditions.

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Definitions:

Meters Per Second

A measurement of speed indicating how many meters are traveled in one second.

Action Potential

A rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane with a characteristic pattern, crucial for nerve signal transmission.

Refractory Periods

Refractory periods are times following an action potential during which a neuron is less responsive to stimuli, ensuring the unidirectional flow of the signal.

Synaptic Knob

The end part of an axon that makes a synaptic contact with another neuron, responsible for the release of neurotransmitters.