Having a foreskin or not having one does not make anyone more or less of a man; or a bad or better lover. Both of those things are a lot more complex than just what kind of penis you have, and have little to do with anyone's genitalia. With that unpacked (as it were), let's get to those basics.
They belong to the respiratory system. This system also includes the nose and the trachea. The main goal of the respiratory system is to provide gas exchange between the blood â¦ and the environment.(AKA breathing). Electrical impulses are sent along the nervous system to and from the brain that regulate all movement. 2  The brain and the nervâ¦. 3  The Most Prominent Causes for Bronchiectasis Bronchiectasis is a disease in which the walls of the airways in the lungs are structurally damaged, making it hard to breathe.
Stem cells in the lung. Our lungs work hard. In an average lifetime, human lungs take 20-40 million breaths and experience a daily airflow of between 7000 and 10,000 litres. Mammalian lungs are made up of two distinct regions:1. The conducting airway tubes, including the trachea, bronchi, and bronchioles. 2.n normal lungs, progenitor cells are present in abundance throughout each region. These cells divide to replace old or damaged lung cells, which keeps the lung healthy. The progenitor cells include tracheal basal cells, bronchiolar secretory cells (known as club cells), and alveolar type 2 cells.