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.
Plasma epinephrine concentration increases during aerobic exercise in proportion to the intensity of the exercise. Anaerobic exercise provokes even greater concentration increases (see Metaboreflex). In the curve above, anaerobic metabolism probably contributed to the steep epinephrine increase seen at 200 Watts and above. Heart rates were 175 to 180 beats per minute at the most strenuous level of exercise. Plasma epinephrine concentration increases very rapidly at the beginning of exercise. But when exercise targets a specific workload, epinephrine increases even further, but less rapidly, over time, as shown below. The workload in this case was 67% of maximum O2 uptake.