As most people are aware, marijuana is the most widely used illicit drug in the world. 1 Cannabis is the second most smoked substance, after tobacco. In the past few years, recreational use of ...

Instead, surfactant is also important in narrow tubular respiratory structures such as the terminal airways of mammals and the air capillaries of birds. (3). Insect tracheoles: We investigate the ...

The respiratory system is responsible for the exchange of carbon dioxide and oxygen in the human body. This system also helps remove metabolic waste products and keep pH levels in check. The major ...