Which of the following is a physical consequence of marihuana abuse?

Bloodshot eyes are a well-documented physical consequence of marihuana abuse. The active component in marijuana, THC (tetrahydrocannabinol), causes blood vessels to expand, leading to an increase in blood flow to the eyes. This results in a reddening effect, which is commonly known as "bloodshot eyes." This physical manifestation is one of the more noticeable effects that can occur shortly after using marijuana.

In contrast, increased appetite is often referred to in the context of marijuana use but is more associated with the psychological effects rather than being purely physical. Decreased heart rate does not typically occur; instead, marijuana can sometimes cause an increased heart rate, depending on the individual and the amount consumed. Improved coordination is not a physical consequence of marijuana abuse; in fact, marijuana can impair motor skills and coordination, making it a poor choice for activities that require precise movements or focus.