COMD 2081 Chapter : COMD
Document Summary
12 pairs of ribs that form a cylinder like structure probides primary structural support. 8-12 false ribs external intercostals: lift ribcage when you inhale out and up internal intercostals- compress ribcage when you exhale down and in inhale- expand ribcage exhale- ribcage compresses. Used in elevating the rib cage for respiration. Iv. lungs lower airway- trachea a tube of 20 cartilage rings. Helps to support the lung system- flexibility. Breathe in: chest muscles pull ribs up and out dia moves down. Breathe out; chest muscles relax, dia moves p to push air out of lungs. Only passage for exchange of gases: diaphragm thick dome shapes muscle that form the floor of thoracic cavity. Phonatory mechanism the larynx is a valve that prevents substs. From entering the trachea. (primary) increases subglottal air pressure- pressure below vocal folds when they are closes (primary) Cartliages- coonectie tissue that keeps the larynx in plce and help it make adjustments (thyroid, cricoid, arytenoid)
