Search found 11 matches

by Aymeric
Fri Dec 20, 2013 8:38 pm
Forum: Cell Biology
Topic: Do We Have The Freedom Of Choice?
Replies: 27
Views: 55094

I don't understand how non-determined free will is observable... And even if it were, how would you tell that it is NOT an illusion deriving from the fact that you are a conscious being? Being conscious means being able to look at yourself WHILE being you, unlike other animals who can only be aware ...
by Aymeric
Fri Dec 20, 2013 8:14 pm
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 13080

Thank you two for your explanations! I guess my mistake was to think that elements move towards wherever they will have more space, whereas in reality they just move randomly and that's it. Right?
by Aymeric
Fri Dec 20, 2013 6:36 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19088

Thanks Darby, but the article is about renal gluconeogenesis, which starts only in prolonged fasting conditions, unlike liver GNG. Yes it is true that glycogen reserves would usually be enough, but that doesn't mean that GNG does not take place all the same, apparently both metabolisms can occur at ...
by Aymeric
Tue Dec 17, 2013 2:02 pm
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 13080

Thanks for your reply, but there is no mention of any such mechanism at alveoli level, the exchanges there seem to be completely passive. Would you have any references about 'non-passive' exchanges in the alveoli? I have never heard of that and my course never mentions it.

Thanks!
by Aymeric
Sun Dec 15, 2013 1:02 am
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 13080

Diffusion and concentration gradient

Hello, We have been working on the respiratory system and once more this involved concentration gradients. I more or less understand how it works by now (it's been mentioned a lot in other systems as well) but what intrigues me is that the concentration gradient can be different for several types of...
by Aymeric
Sat Dec 14, 2013 11:51 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19088

Re:

it does not relate to the timing but to the question whether they can run at the same time with glycolysis JackBean I've just had a check at another textbook and you were right! Unlike what I first thought, glycolysis can't take place once glycogenolysis has started because the pyruvate kinase is i...
by Aymeric
Sat Dec 14, 2013 11:11 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19088

Re:

Isn't gluconeogenesis SYNTHESIS of glucose, rather than breakdown of glycogen? Yes, I'm not sure what your point is (?) I know that predators with almost no carb sources do that, but it seems that it would require pretty extreme conditions to kick in for human... What makes you say that? I mean, ho...
by Aymeric
Fri Dec 13, 2013 2:46 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19088

Re:

it does not relate to the timing But my question was about that exactly... I know that GNG happens, I just don't know when. but to the question whether they can run at the same time with glycolysis I don't see why not? As long as glucose levels are low... what would stop them from running? The phos...
by Aymeric
Fri Dec 13, 2013 12:58 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19088

Thank you!
But then I didn't get the point regarding location. How does the location of GNG in the liver affect the time when GNG starts in relation with the timing of glycogenolysis?

Sorry for not being very quick :)
by Aymeric
Fri Dec 13, 2013 12:50 pm
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19088

Thanks JackBean for these clues. However I am still confused... If I understand correctly what you meant, the effects of GNG would be delayed because of the time it takes to transport glucose to peripheral tissues? I wouldn't imagine that transport time to be that long (at least not the duration of ...
by Aymeric
Fri Dec 13, 2013 10:35 am
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 19088

When does gluconeogenesis kick in during physical activity?

Hello, I'm a dietetics student, and my course is really unclear about gluconeogenesis regulation, and exactly WHEN it happens. What my coursebook teaches me is that glycogenolysis is the main purveyor of energy during physical exercise, and it is triggered by LOW INSULIN, HIGH GLUCAGON and HIGH ADRE...