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| So who here can help me with anatomy & physiology homework? (Read 457 times) |
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posted: 9/9/2006 at 2:50 AM |
The whole purpose behind the breaking glucose down is to create ATP. ATP is what the cell actually uses to do its stuff. It's the currency of energy.
There are two different pathways a cell can produce ATP. One of them is with oxygen, the other is without. You get lots more if you follow the pathway that includes oxygen. I think it's something like 2 ATP without oxygen, 36 with, but I could be wrong.
Anyway, the cell still needs the same amount of ATP, regardless of how it's produced. So, in order to make the same amount of ATP without oxygen as you would with oxygen, you'd have to do a heck of a lot more reactions. (Say the cell needed 72 ATPs. It could run the reaction with the oxygen twice and get 72, or it could run the other reaction without the oxygen 36 times.)
So, if a reaction has to happen a lot more often, the enzymes will get more of a workout. Therefore they work LESS if the cell is able to produce the ATP it needs with the oxygen reaction.
Does that help?
Reminds me more of an IQ test than an A&P problem... |
| Working my way down from 174 to 159 pounds. Currently back at 174. Darn T-day & stress... >:( |
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| view log Runs With Snowplows |
posted: 9/9/2006 at 3:00 AM |
That makes more sense, but my head is still swimming. I really wish I had had better Science teachers back in HS. My Chem. teacher was the WORST! Our Math dept. was also wretched. A lot of parents were ready to petition to have them removed not long before they retired. There's a reason I completed a BA (2, actually), rather than a BS.
k |
Kirsten
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.: 2008 Goals :.
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posted: 9/9/2006 at 3:05 AM |
| It's only been a year since I had A&P... and I'm surrounded by nurses and a nurse practitioner... and we couldn't get it. Don't feel bad! |
| Working my way down from 174 to 159 pounds. Currently back at 174. Darn T-day & stress... >:( |
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posted: 9/9/2006 at 3:25 AM |
I'll let you know. I sent an email to my prof w/ a few questions that I can't seem to find answers to. I'm an obsessive compulsive perfectionist & any less than an A on everything is unacceptable for me, so I dig & dig until I have every answer correct.
I also worked for a fantastic general surgeon for 8 years who was an equally fantastic educator. He didn't just explain the what, he explained the what, the why, the how, etc of everything. He left me with an obsession to know every last detail of every little thing I study. I don't know why I'm working towards nursing, I should just bag it & go to med school...but I guess I'd have to actually understand this damn cellular respiration thing if I went to med school, hey?! |
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways - champagne in one hand, strawberries in the other - body thoroughly used up and totally worn out, screaming: WOO HOO! What a ride!" |
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posted: 9/9/2006 at 4:37 AM |
LOL! Yes, you'd have to learn it there too, I'm certain. And most likely in much greater detail! And understand all the chemistry behind it...
Let us know what the prof says, okay? The only thing we didn't guess was C. I'll be really annoyed if C was the right answer...
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| Working my way down from 174 to 159 pounds. Currently back at 174. Darn T-day & stress... >:( |
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Mile Collector view logAbs of Flabs |
posted: 9/9/2006 at 10:55 AM |
| Is it too late to vote? I'm going with D. It's been a long time since I memorized the Kreb Cycle. However, I believe that oxygen is involved in combining with ATP to form ADP and H2O and has nothing to do with glycolysis. You need a biologist, not a doctor. |
| Beantown Runners | On the Bench |
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posted: 9/9/2006 at 2:36 PM |
| I agree with Mile Collector. Glycolysis is the first step in both aerobic and anaerobic respiration -- oxygen isn't needed in glycolysis, which is separate from the Krebs cycle (TCA cycle). Glycolysis takes place in the cytoplasm and the krebs cycle is in the mitochondria (correct me if I'm wrong). So, since pyruvate is transported into the mitochondria as it's made (transforming into Acetyl CoA?), the product of the rx is removed and glycolysis will keep on going whether oxygen is present or not. |
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posted: 9/9/2006 at 9:31 PM |
Bingo, Poose, you are precisely correct!! 
I was leaning heavily on the oxygen thing...it took me until this morning when I was slightly more awake to realize that she was asking about GLYCOLYTIC enzymes, and as you said, oxygen isn't required in glycolysis. Maybe this is the reason why I don't do homework so late at night??? |
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Ladies Locker Room :.
"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways - champagne in one hand, strawberries in the other - body thoroughly used up and totally worn out, screaming: WOO HOO! What a ride!" |
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posted: 9/9/2006 at 9:47 PM |
| That's what I said... in a more roundabout way. Your explanation is much clearer. Thanks! |
| Working my way down from 174 to 159 pounds. Currently back at 174. Darn T-day & stress... >:( |
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| view log Funky Monkey |
posted: 7/3/2008 at 7:23 PM |
| Quote from backroadrunner on 9/9/2006 at 1:39 AM: Any docs out there? Anyone just super smart than can answer a cellular metabolism question? I'm bloody stuck on this stupid question...
Glycolytic enzymes in human muscle tissue will work better if all of the following are true EXCEPT:
a. the pH is 7.4
b. glucose is present
c. body temp is 98.6
d. oxygen is present
My book & lecture notes are not helping & I've just spend 45 minutes reading medical journal articles (which usually fascinate me & I usually understand), and I'm even more confused about cellular metabolism than I was before!!
I can't wait to get into the identifying structures part of A&P...give me a cadaver I'm all set to go. Ask me about cellular respiration, DNA, organelles, etc, I'm either confused or sleeping!! Ask me breast or GI anatomy questions or anything related to general surgery, I'm like a textbook. This stuff sucks!
Thanks for any help someone might give!! I'd appreciate it!!
Eryn
How did this all work out?
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| It's all fun and games until the flying monkeys attack. |
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