Easy Come Easy Go

Lung tissue has a full-time job just getting oxygen out of the incoming air and into your blood stream while it simultaneously grabs up the spent fuel from the blood so that can be dumped from the body.

It is left to your breathing muscles to actually move air into and out of the body. Muscles and lung tissue of course take orders from the brain where a second-by-second record is kept on exactly how much oxygen is needed by each muscle and body process at any given moment. A pretty fancy dance when you think about it. The brain sends orders for faster or slower breathing down to the respiration department.

A double layer of intercostals muscles is sandwiched between each pair of ribs and the big elastic diaphragm stretches across the bottom rim of your ribcage. To draw a breath in, the intercostals lift and swing your ribs gently out and up while the diaphragm flattens down. This effort creates a slightly enlarged ribcage. Fresh oxygen-rich air rushes in from outside the body to fill this new vacuum (similar to the action of a syringe or a bellows).

To exhale, the intercostals and the diaphragm simply relax and collapse. The ribs drop down out of the upward flare while the diaphragm rises to its domed-up resting position. This overall relaxation results in a slightly smaller ribcage with smaller capacity. There is no place for the contained air to go but out. Exhalation is simply a letting go of the breathing muscles without slumping the spine. Inhalation is active. Exhalation is letting go of that action.

Be well. Breathe beautifully.