Mechanism of Breathing

Mechanism of breathing occurs in phases. It means the inflow and outflow of air between atmosphere and alveoli of the lungs that is affected by expansion and contraction of the lungs (Figure 13). There are mainly two processes involved in contraction and expansion of the lungs. Inspiration/Inhalation Inspiration is defined as the process of breathing … Read More

Parts of Human Respiratory System

Nose (nostrils), nasal cavities, internal nares, pharynx, larynx, trachea, bronchi, alveoli, and lungs (Figure 5) are the parts of human respiratory system. Various Parts of Respiratory System Nostrils These are paired external openings in nose that open into two nasal cavities. Nasal Cavities There are two nasal cavities present. These cavities are separated from each … Read More