Final answer:
The primary method of magnesium excretion is through urine, facilitated by the kidneys filtering the blood. While feces, sweat, and breath can also expel waste, they are not the main avenues for magnesium removal.
Step-by-step explanation:
The primary way to get rid of magnesium is through the urine. The kidneys play a crucial role in the excretion process, filtering wastes and excess substances, including magnesium, out of the bloodstream to form urine. This urine is then expelled from the body, carrying with it the magnesium that needs to be eliminated. While other methods like feces, sweat, and exhalation can also remove some wastes and excess substances, they are not the primary means of magnesium excretion.
Excretion is vital as it is the process of removing wastes and excess water from the body. The body disposes of waste as gas, liquid, and solid, with urine being the main liquid waste. The excretory system ensures that substances like magnesium do not accumulate to harmful levels.