catabolism and anabolism endergonic, exergonic, endothermic, exothermic

[Jordwin]

Okay, so this may have been discussed previously, but how is catabolism not endothermic? Is it not breaking bonds?

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[LazyP]

It is breaking bonds thus it releases energy (exothermic). anabolism is endothermic because energy is required to synthesis molecules.

 

[bigTOOTHguy]

this is opposite of chemistry bond breaking and forming, you can try and remember it that way

 

[Xo1991]

exergonic just means energy released. in many cases breaking bonds is endergonic, but because so much ATP is made, it becomes exergonic despite the fact that breaking the bonds is endergonic.

 

[denttal]

Chad discussed this confusion in one of his videos.

Basically he said that, in physiology, when you think of catobolism, it is breaking down of some large substrate into smaller units, but because MORE BONDS ARE THEN MADE THAN ARE BROKEN it is an exothermic reaction/gives off energy.

Exergonic means more bonds are made than are broken (overall - energy given off) and Endergonic is more bonds are broken than are made (overall - more energy needed by system).

 

[Jordwin]

Thanks everyone!