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).
Explain the roles of chest wall muscles, diaphragm, chest wall skeleton, pleural cavities, pleura and lungs in breathing in and out. [Covered in Anatomy in detail] Diaphragm is the main muscle involved in breathing. Contraction of diaphragm pulls the domed centre down and increases height of pleural cavities.