Quick Answer. In an officially-sanctioned MLB baseball game, there are 9 innings. If the home team is ahead in the top of the ninth and earns 3 outs, the game ends at 8 1/2 innings. If the game is tied after the away team earns 3 outs in the bottom of the ninth, the game goes into extra innings. Keep Learning.
When you exercise, the muscles you use require more energy. When exercise can be sustained, this demand is met primarily by aerobic means. Aerobic energy production in muscles results in increased gas exchange at the lungs, because more oxygen is taken in and more carbon dioxide is released.
During aerobic activity the body uses other resources such as carbohydrates and fats from the glucose in your muscles, liver, and blood to make Adenosine Triphosphates. The increased blood flow produced during muscle contraction optimizes energy usage for both aerobic and anaerobic activities. Aerobic vs Anaerobic. At rest our body uses aerobic metabolism to fuel our body with energy. As we gradually start to exercise and slowly increase demand we can maintain use of aerobic energy production. As intensity increases we get to a point where we start feeling fatigue and anaerobic metabolism begins.