Final answer:
Stress and tension lead to a reduced oxygen supply and an increase in lactic acid in muscles, causing spasms and pain due to ischemia and irritation from lactic acid buildup.
Step-by-step explanation:
Stress and tension cause a decreased supply of oxygen and a buildup of metabolic wastes in the muscles, which results in spasms and pain. Stress leads to the constriction of blood vessels, hindering blood flow, hence reducing the oxygen delivery to muscle tissues. The reduced blood flow also means that metabolic byproducts like lactic acid accumulates, contributing to muscle tension and pain.
Stress and tension cause a decreased supply of oxygen and a buildup of lactic acid in the muscles, which results in spasms and pain. When muscles are overused or under stress, the circulatory system may not be able to keep up with the muscle's demand for oxygen and nutrients. This lack of oxygen, referred to as ischemia, can lead to muscle spasms and discomfort. Simultaneously, the muscle metabolism shifts towards anaerobic processes, which result in the accumulation of lactic acid. Elevated levels of lactic acid can irritate the muscle fibers, causing a sensation of pain and leading to spasms.