The Respiratory System
The lungs are in the upper part of the body called the thorax
They are protected by the ribcage
The trachea, or windpipe, is held open by rings or cartilage
The bronchi are tubes leading into the lungs which also have rings of cartilage to keep them open
The alveoli provide a large surface area for gas exchange
The intercostal muscles are used in breathing
The diaphragm is a sheet of muscle which is important for breathing
The ribs protect the heart and lungs and are where the intercostal, or rib, muscles are attached
C These air passages get narrower and narrower, ending at the alveoli Review Which is the correct of structures that air would pass through as it entered the lungs? C These air passages get narrower and narrower, ending at the alveoli
Which of the following labels is pointing to the alveoli? A, B is trachea and C is bronchus