the act of breathing
respiration
refers to the intake of air into the lungs
inhalation or inspiration
refers to breathing out or the movement of gasses from the lungs to the atmosphere
exhalation or expiration
refer to the movement of air into and out of the lungs
ventilation
two types of breathing
costal thoracic breathing and diaphragmatic abdominal breathing
involves the external intercostal muscles and other accessory muscles, such as the sternocleidomastoid muscle
costal breathing
involves the contraction and relaxation of the diaphragm; observed by the movement of the abdomen
diaphragmatic breathing