carbon dioxide and oxygen are exchanged across capillary and alveolus walls. Hemoglobin binds with and transports oxygen that diffuses from alveoli to capillaries. It also increases the efficiency of gas exchange.
Carbon dioxide is transport in the blood in three ways, Most combines with water and forms carbonic acid. Some dissolves in plasma. Some binds to hemoglobin and proteins in plasma.
Breathing Movements of the diaphragm and rib cage change air chest cavity during inhalation and exhalation.
The dome-shaped muscle at the bottom of the chest cavity is the diaphragm During inhalation, contraction of the diaphragm and rib muscles increases chest volume and air rushes in, In exhalation, these muscles relax and air rushes out
The nervous system has final control of the breathing muscles. Breathing does not require conscious control
smoking and the Respiratory system Chemicals in tobacco smoke damage structures throughout the respiratory system and have other negative health effects, smoking causes a number of diseases, including chronic bronchitis emphysema, and lung cancer