Part of Biology (Single Science) Cells, organ systems and ecosystems The air that enters the nasal cavity flows down the trachea. The trachea has a number of adaptations: cartilage rings in the walls ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Take a deep breath in …and out. Feels good, right? And it's also necessary for staying alive. But what ...

Air enters the body and is warmed as it travels through the mouth and nose. It then enters the trachea. The trachea divides into two bronchi. One bronchus enters each lung. Each bronchus branches out ...

The human respiratory system is composed of a network of tissues and organs that enable the body to absorb oxygen from the air as well as expel carbon dioxide and other waste gasses. These functions ...

Bronchiectasis is a chronic condition of the respiratory system, in which there is abnormal widening of the airways due to an initial damaging factor. This in turn reduces the ability of the bronchi ...

High blood pressure (hypertension) causes thickening of the blood vessels and hardening of the arteries (arteriosclerosis). A study conducted by Brazilian researchers has shown for the first time that ...