They say our breath goes in and out because our lung expands and creates a vaccum.But why does the lung expand ?
2006-09-24 03:22:13 · 10 answers · asked by sud 2 in Health ➔ Other - Health
Think of your lungs as a balloon in a jar connected to the outside by a tube through the bung. There is another tube through the bung, connected to a vacuum pump. When the pump is turned on, the pressure in the jar is reduced. However the balloon still has a connection to the outside, where the pressure is higher. As a consequence the outside air is pushed into the balloon through the tube. This is breathing in.
If you then turn off the pump, the pressure inside & outside the balloon is equalised, so the elasticity of the balloon forces the air out.
Breathing is similar. The diapragm pulls down, decreasing the pressure inside the ches, so air is pushed into the lungs. When the diaphragm relaxes the pressure is equalised, so the elasticity of the lungs forces the air out. Of course, you can also actively push the air out.
2006-09-24 04:45:08 · answer #1 · answered by doctor 5 · 1⤊ 1⤋
The diaphram, the muscle that separates the thorax and the abdomen is like a an upside-down "U". When you breath, it pulls down and creates a vacuum that expands the lungs. As the lungs expand they pull in air.
Other muscles also help breathing: the muscles in between the ribs also help expand the chest cage and lifting the arms, also also helps, but normally they are not used.
We exhale, because the lungs are naturally elastic, so they expulse air on thier own, however, by increasing pressure in the abdomen it helps push out the air faster.
2006-09-24 03:37:26 · answer #2 · answered by hoggygilligan 1 · 1⤊ 0⤋
This Site Might Help You.
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How do we breathe?
They say our breath goes in and out because our lung expands and creates a vaccum.But why does the lung expand ?
2015-08-16 23:32:38 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Normally we take in air through our nostrils. When we inhale air, it passes through our nostrils into the nasal cavity. From the nasal cavity, the air reaches our lungs through the windpipe. lungs are present in the chest cavity. this cavity is surrounded by ribs on the sides. a large muscular sheet called diaphragm forms the floor of the chest cavity. Breathing involves the movement of the diaphragm and the rib cage. During inhalation, its move up and outwards and diaphragm moves down. this movement increases space in our chest cavity and air rushes into the lungs. the lungs get filled with air. during exhalation, ribs move down and inwards, while diaphragm moves up to its former position. this reduces the size of the chest cavity and air is pushed out of the lungs. these movements in our body can be felt easily. take a deep breath. keep your palm on the abdomen. what do you find? after having learnt that during breathing their are changes in the size of the chest cavity,children got involved in the chest expansion competition
SMOKING DAMAGES LUNGS. SMOKING IS ALSO LINKED TO CANCEE. IT MUST BE AVOIDED
2014-07-11 01:59:55 · answer #4 · answered by Anonymous · 1⤊ 0⤋
I'm not breathing deeply enough... that's just because this very second I'm watching my dad sleep his last night.... I'll breathe with you, but I'm sure I won't do it the way I should.
2016-03-15 08:25:43 · answer #5 · answered by ? 3 · 0⤊ 0⤋
IN side there are little sacs and the hold the air. THEN when you breath out the sacs go empty.
2006-09-24 03:26:59 · answer #6 · answered by Anonymous · 0⤊ 1⤋
If you think of teh lung as a muscle it should pretty much explain it for you.
2006-09-24 03:33:38 · answer #7 · answered by mr_oilfield_78 2 · 0⤊ 1⤋
lungs expand with full of oxygen.oxygen purify the blood
2006-09-24 03:34:56 · answer #8 · answered by guharamdas 5 · 0⤊ 1⤋
so that there is a place for the air to go. we couldn't suck air in if our lungs didn't move.
2006-09-24 03:30:28 · answer #9 · answered by snicker 4 · 0⤊ 1⤋
they expand to let the air in. they create room.
2006-09-24 03:30:19 · answer #10 · answered by fluffyorangekat 3 · 0⤊ 1⤋