Question

Muscle cells will produce lactic acid when:

Answer

there is an excess of NADH


there is a shortage of water

there is a shortage of water


there is a shortage of glucose


there is an excess of NADPH
I thought lactic acid was produced with low levels of O2?

Answer 1

@mrdoldum Sorry for spamming you, but I trust only you right now, <3

Answer 2

So because it is low levels of Oxygen, then would it be Shortage of water?

Answer 3

@Tutormenoq2 Our muscle cells definitely perform fermentation via the lactic acid method, but I am not sure what the exact chemical that the muscles use as a signal to switch. Give me a bit to think and read my old notes. Unfortunately my copy of Vander's Human Physiology is in my office and I am at home.

We can think logically about it though. It must be done after glycolysis so something at the end of glycolysis or what would happen right afterwards would be the signal I would think.

Answer 4

@Tutormenoq2 Did you get all the options listed correctly? There are repeats. You aren't spamming me. The only reason I am on here is because I couldn't sleep one night, found the site, and decided to correct some horribly misunderstood evolution concepts. I don't know if you looked at my profile, but I am a 5th year PhD student and have not asked a single question on the site. So, when I say I am on here to help, I really mean it and I think my profile shows that.

Answer 5

Nopr I did not, lol, that is how it is. :)

Answer 6

@Tutormenoq2 Really, those are the options?

Answer 7

Yea lol.

Answer 8

@Tutormenoq2 Okay, there are ones we can remove. Do you know where youwould find NADPH?

Answer 9

Krebs cycle. and hydrogen gradient

Answer 10

Sure? There are NADPH and NADH one is plants one is non-plants.

Answer 11

@Tutormenoq2 NADPH is only found in plants and it allows plants to regulate the Calvin Cycle separately from the Krebs cycle.

What about glucose? Could a shortage of glucose create increased lactic acid via fermentation? When is glucose used in these metabolic processes?

Answer 12

so shortage of glucose is answer?

Answer 13

@Tutormenoq2 Glucose is the base of all the metabolic pathways in cellular respiration. It goes glucose used in glycolysis, from there it is either fermentation or krebs cycle and krebs cycle to ox.phos. So it cannot be a shortage of glucose; no glucose, no ATP production (this is a bit of a lie because a few other chemicals can be used.)

NADPH is out because that is not in cellular respiration.

Answer 14

So shortage of water...?

Answer 15

?
@mrdoldum

Answer 16

@Tutormenoq2 Well, I am not really sure, but I believe so. So, what is going on is that the normal processes cannot keep up the NAD+ --> NADH and a excess of NAD+ build up. Fermentation is what is used to deal with this excess. I believe that the hydrogen proton is coming from water.

Answer 17

I think you are right.