inhalation, exhalation, oxygen intake, chest expansion
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Answer:
INHALATION: Inhalation or Inspiration is a part of breathing where the air is taken into the lungs by creating negative pressure by the contraction of respiratory muscles and diaphragm.
EXHALATION: Exhalation or Expiration is a part of breathing where the air is drawn out of the lungs by the relaxation of respiratory muscles.
INTAKE OF OXYGEN: The average adult, when resting, inhales and exhales about nearly of 7 or 8 liters of air per minute. That totals about 11,000 liters of air per day. Inhaled air is about 20-percent oxygen. Exhaled air is about 15-percent oxygen.
CHEST EXPANSION: Chest expansion is caused because of the increase of volume of the lungs, the chest wall expands. This results from the contraction of the intercostal muscles, the muscles that are connected to the rib cage. Lung volume expands because the diaphragm contracts and the intercostal muscles contract, thus expanding the thoracic cavity.
Explanation: