You can elect to use a 52-53-week tax year if you keep your books and records and report your income and expenses on that basis. If you make this election, your 52-53-week tax year must always end on the same day of the week.
Forced Inhalation. Involved in the mechanics of breathing; The muscles involved in this type of breathing are the diaphragm, the external intercostal muscles, and the accessory respiratory muscles (activated when respiration increases significantly).
The diaphragm is the main muscle used in breathing. the other parts are the lungs,oxygen,capillaries,nose,carbon dioxide, The organs of the respiratory system responsible for conducting air include the nose/mouth, pharynx (throat), larynx (voicebox), trachea, and bronchi.