Long-distance runners (26.2 miles) describe Runner's High as a feeling of euphoria. It is often described as a feeling of being invincible and individuals claim a lost sense of time while running, Runner's high is believed to be caused by very
small molecules called endocannabinoids released by the brain that affect the way a person feels, moves, and reacts.
Based on the information above what you know of interacting systems, which of the following two are correct?
A. If the release of endocannabinoid molecules are increased, the runner will not experience the feeling of euphoria and will stop running.
B. The muscular system is not affected by the release of endocannabinoids, which are released by the nervous system.
C. If the function of the nervous system is compromised and endocannabinoids are not released, the function of the
muscular system is affected and prolonged endurance will be jeopardized.
D. The release of endocannabinoids at the cellular level play an indirect role in stimulating muscle contraction.
E. If there is a functional change at the cellular level and endocannabinoids are not released, the effects will be
experienced at the tissue, organ, organ system, and organismal level.