Why are scuba divers warned not to hold their breath when swimming upward?

Question

pleas help..

thank you!

Answer 1

The problem is ascending while holding one's breath after having breathed from compressed air.  If you fill a balloon with air from a tank, at the bottom of the swimming pool, if you release it, it will expand as it goes up, and will likely pop.  You don't want your lungs to 'pop,' which is called a pulmonary embolism.  It is very serious.  People are taught to never hold their breath while diving to eliminate this risk.  In common practice, especially in advanced diving, one does nearly hold ones' breath, but in a safe way, which is achieved by experience and training.  It is more of a breath control than a hold, actually.

Answer 2

they do so bcoz if they hold their breath,due to change in pressure the lungs may get damaged resulting in stroke or heartattack leading to even death.bubbles may form in haemoglobin in the blood.

Answer 3

Divers are taught not to hold their breath because of the high risk of lung over expansion injury. Holding your breath has nothing to do with "the bends" or Decompression Sickness. The Bends are caused by ascending too quickly and the nitrogen in your system does not have the time to be expelled from your body. Lung over expansion is caused by the air volume being too much for your lungs to handle. Air will double it's volume every 33 ft that you go up. If you have a full breath then you won't even make it that far without an air embolism. An air embolism can do many things to you if they happen. It can collapse a lung, squeeze your heart, squeeze your neck, or even work it's way to your brain. There are other problems that can happen that I can't remember at the moment. An air embolism or lung over expansion is not something to mess with. These injuries require immediate medical attention.

Most diving accidents are all called Decompression Illness(DCI), however, the two types are Decompression Sickness (DCS) or Lung Over Expansion. The second being the most critical and most likely to kill a diver.  

Answer 4

A couple of reasons..

First, is to prevent them from getting 'the bends', which is decompression sickness.  The change in pressure can make you very very sick if you're not careful.

Also is possible lung damage.  The deeper you go, the less volume air will take up.  If you have a full breath in your lungs, as you swim upwards, that air will take up more space.  

Answer 5

Because you need to equalize the air in your lungs.  Like the pressure in a can of soda.  If you shake it and shake it up, it will explode when you open it.  Well, breathing equalizes that air and when you hold your breath and travel even a short distance up or down, you will cause lung overexpansion.  This will either seriously harm you or kill you.  There is a reason that it is the #1 rule.

Answer 6

As the diver ascends the water pressure decreases and the air expands.  Too much expansion blows the lungs up like a balloon.  Pop.