Also...why do we yawn?
its just very confusing to me.
and i'd like to know.
Answer:
we sneeze to get irritants out of our nose. When you yawn your body is asking for more oxygen. As you get tired you are breathing less and your alveoli gets smaller. Alveoli are the air sacks in your lungs. When you yawn the air rushes into your lungs and all the alveoli sacks pop open to let more oxygen circulate into your bloodstream. Also as an after thought, yawns are contagious. As you yawn watch everyone around you. they will start to yawn also.
To get rid of germs and stretch your jaws? J/K I really don't know...I never thought of this before!
About 25% of people do actually sneeze when exposed to bright lights like the sun. We do not know exactly why this happens, but it might reflect a "crossing" of pathways in the brain, between the normal reflex of the eye in response to light and the sneezing reflex.
The simplest answer is that we don鈥檛 really know
A sneeze is a reflex triggered by sensory stimulation of the membranes in the nose, resulting in a coordinated and forceful expulsion of air through the mouth and nose. A "reflex" means that some type of stimulation of your body causes you to react in a way that is NOT under your control, in other words you do it automatically without thinking and you can鈥檛 even stop it. Your body has many reflexes - the other one important to us here is called the "pupillary light reflex". If you shine a light in your eyes, your pupils get smaller, or constrict. You should be able to see this easily in a friend using a flashlight (or in the mirror
want to know more
http://www.madsci.org/posts/archives/aug...
to sneeze, is to clean out irratents out of our nose.
To yawn, is to show were tired and need sleep.
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