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 exercise, systolic pressure should gradually increase as your heart beats harder and faster and your arteries contract to pump more oxygen-rich blood. However, because the arteries in your working muscles start to dilate rather than constrict, the net result is little change in your diastolic pressure.