The Involvement of the Brain's Opioid System in "Runner's High

question 346

True/False

The involvement of the brain's opioid system in "runner's high" suggests one possible explanation for why endurance athletes have a much lower pain tolerance than do non-athletes.

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Definitions:

Parenchyma

A type of plant tissue composed of living cells, typically having large vacuoles, thin walls, and found in parts of the plant responsible for photosynthesis, storage, and transport.

Sieve-Tube Member

A cell found in the phloem of vascular plants, part of a system that transports sugars and other metabolic products downward from the leaves.

Vascular Tissue

The specialized tissue in plants that is involved in the transport of water and nutrients; it includes xylem and phloem.

Inhibited Growth

A reduction in the normal rate of cellular or organismal growth, often caused by environmental factors or genetic conditions.