Medical Mystery II

last SG · 2005-12-03T23:59:50+00:00

i got the book. i dunno where you can find but nus medical library confirm got

ndmmxiaomayi SG

Originally posted by alfagal:
[b]NEW MYSTERY
There are many behaviors when a person consumes alcohol..some become rowdy, some become less sober...

Now...Qn:
Why does a drunk person not able to walk in a straight line?

[/b]

Alcohol can make people react slower and less sober.

When they are less sober, they can't walk in a straight line.

alfagal SG

NEW MYSTERY

Humans have two eyes. But, the world appears the same even if you have one eye, and no problem walking around with one eye....

Qn: What are the uses of having two eyes?
There are two main reasons for this.

MYSTERY SLOVED

Main two reasons:
1. Have a wider visual field. however this is nothing compared to animals who have eyes on their sides, eg, rabbits, birds, esp. eagles, for prey and predator (survival uses)

2. For effective motion detection and processing in the brain. The brain process the differences in moving images between the two eyes to judge the speed and direction of the moving object.

As mentioned, depth (2D or 3D) cues can be detected even with one eye, therefore, they are usually considered monocular cues.

alfagal SG

uh huh, but how come that happens?

what happens when you drink alcohol..where does it go? what area does it affect?

ndmmxiaomayi SG

Originally posted by alfagal:
[b]NEW MYSTERY

Humans have two eyes. But, the world appears the same even if you have one eye, and no problem walking around with one eye....

Qn: What are the uses of having two eyes?
There are two main reasons for this.[/b]

To prevent parallax error?

Another reason because of the shifting of things. Meaning that when use right eye and see, the thing is at this particular place. When use left eye to see, the thing appears at another place.

ndmmxiaomayi SG

Alcohol gets absorb into the bloodstream. It will affect the central nervous system, which resulted in loose muscle tone, loss of fine motor coordination. This makes them not to walk in straight lines.

alfagal SG

not sure bout loose muscle tone though,

but yeah close...loss of fine motor coordination....which part of the body controls it?

alfagal SG

nahz..this doesnt make sense now..

meaning your left eye will not b able to see whats on your right?

ndmmxiaomayi SG

The brain. Alcohol will impair the parts of the brain controlling behaviour, memory, concentration and coordination. As the part controlling coordination is impaired, it causes a loss of fine motor coordination.

alfagal SG

which part of the brain in particular?
note: it doesnt impair, its not permanent. its inhibition (temperarliy)

ndmmxiaomayi SG

No lah. The things will appear at a slightly different position and one-eyed people still can see.

alfagal SG

yes thats e prob..if u can see with one eye, why need two?

ndmmxiaomayi SG

Oh..... not impaired

Not quite sure which part of the brain, the cerebellum, I think. This was never studied in detailed when I did bio, so know nothing about it.

ndmmxiaomayi SG

Hmm, hard one.

alfagal SG

yup you got it gal..the cerebellum. Very Happy

btw: walking is a gross motor skill (inc running, jumping and hoping)
e.g of fine motor skills are: writing, buttoning up your blouse, tying shoe laces etc...

alcohol affects the cerebellem, which controls motor functions, both fine and gross motor skills. after the alcohol is no longer in the bloodstream, the functions of cerebellum goes back to normal

ndmmxiaomayi SG

Guessing for the eye question. Is it because we need 2 eyes to see the 3D world? One eye can only see 2D.

alfagal SG

hmm...
so you mean when you watch tv with one eye, the human character appears flat unless u open two eyes to watch?

but good thinking there w regards to 2D and 3D...
what ever you see is a 2D image casted on your retina...but the brain processes it to become 3D.

think: do it now. close one eye. then open both...what is e difference?

ndmmxiaomayi SG

This one read from website. Because of prey-predator relationship. If you have one eye, you either can see your left or right. But if got two eyes, can see left and right and maximize the field of view. That is why our face is round (not circle that kind of round, but round enough to be called round)

ndmmxiaomayi SG

Not too much difference, except for the shifting of thingy I explained just now. You also see a narrower view of things. When things are viewed with two eyes, there are more things seen. However, when one eye is closed, only can see a percentage of what two eyes see.

alfagal SG

yeah! got one of the reasons correct.. Laughing

we have two eyes so that we can have a larger visual field. ard 200 degrees..to see the span of your vision (peripheral) stretch both of ur hands straight, then to your sides inline with your ears..you will find that you can still see your arms...now, extend them abit more backwards..you still can see them for a lill more before they disappear...

for some pple, they can have more than 200 degrees of visual span.

now the second reason
CLUE: tracking of object

ndmmxiaomayi SG

Tracking of object??

Like see where the aeroplane has flown?

I think got to do with rotation of eyeball.

Got two eyes can see faster.

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