Each lung is covered by a double-layer serous membrane with a potential space between the two layers. The outer or parietal layer covers the inside of chest wall and superior surface on diaphragm and is sensitive to pain; the inner or visceral wall covers the lungs and its fissures but insensitive to pain. The parietal layer is supplied by blood [...]
In this article we will discuss about the structure of respiratory tract of humans with the help of suitable diagram. Also learn about its functions. i. Upper respiratory tract extends from the upper nares to the vocal cord. (Fig. 8.1) ii. Lower respiratory tract extends from the vocal cord to the alveoli. Trachea: The trachea (windpipe) is a cartilaginous and [...]
After reading this article you will learn about the various drugs acting on respiratory system. Expectorants: (Mucokinetic agents/Brochomucotropic drugs): Are the drugs which increase respiratory secretions or sputum volume and reduce the viscosity of sputum. The word expectorant comes from a Latin word "expectorare" which means to derive from chest. Cough: Cough may be of two types: (i) Less frequent [...]