Your respiration ... aerobic activity 3 days a week. You should also add in strength training two times a week to round out your routine. Anaerobic exercises can be taxing on the body.

Unlike aerobic respiration, oxygen is not necessary for anaerobic respiration to take ... circulatory system and digestive system in the human body, through blood vessels and into mitochondria.

The paper, titled "Simultaneous aerobic and anaerobic respiration in hot spring chemolithotrophic bacteria," is published in ...