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.
Gas Exchange During Exercise. During exercise, your body needs more energy, which means your tissues consume more oxygen than they do at rest. Consuming more oxygen means you will also produce more carbon dioxide because your metabolic rate is elevated. The ratio of carbon dioxide produced per oxygen consumed also increases during exercise because a shift from fat to carbohydrate utilization takes place. At the most challenging work rates, you burn carbohydrates exclusively and produce 1.0 liter of carbon dioxide for every liter of oxygen you consume.
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.