Hey Friend! I like your picture!
Selenium deficiency can cause destruction of the heart muscle. Selenium deficiency can lead to something called Keshan disease. One of the main symptom of Keshan disease is myocardial necrosis, leading to weakening of the heart.
Source: My brain, my biology books.
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1. Ingestion
2. Digestion
3. Motility of the GI wall/ Mixing Movement
4. Secretion
5. Absorption
6. Elimination
When you run or do other exercises your working your cardiorespiratory system. when you work on something it gets stronger and more able to do excercises fpr a longer period of time