A basic review of the anatomy, physiology and personal protective equipment related to the respiratory system.

The human body is naturally equipped with defenses to fight off viral infections. For a virus to successfully infect it, it must first overcome these defenses. To do so, viruses have evolved ...

It has been found that people exposed to fire smoke had noticeable changes in their immune systems, the cells of which were ...

For children, a normal respiratory rate varies by age. For adults, it's typically between 12 to 20 breaths per minute. Learn more.

A weakened immune system makes it harder to fight respiratory infections, including COVID-19, flu and RSV. It can also reduce the body’s ability to maintain long-term protection from previous ...

The human body has three primary lines of defense to fight against foreign invaders, including viruses, bacteria, and fungi. The immune system’s three lines of defense include physical and ...

In the human body, there are three types of muscle tissue: Skeletal tissue: Skeletal muscles control the tendons, ligaments, and bones of the musculoskeletal system .